- NEW: Romney campaign to unleash "robust" spending in final weeks of campaign
- NEW: Convention bounce deflates, Obama, Romney polling at August numbers
- Republicans step up criticism of Obama on Libya, Iran
- Chris Christie: "This whole race is going to be turned upside down come Thursday morning"
Washington (CNN) -- Republicans intensified their criticism of President Barack Obama's foreign policy on Monday, noting questions about his administration's slow-to-evolve accounting of last month's deadly attack on an American diplomatic post in Libya and the U.S. response to Iran's nuclear ambitions.
GOP presidential nominee Mitt Romney said in a Wall Street Journal opinion piece two days before he meets Obama in the season's first presidential debate that the United States could be brought into another fight if the turmoil in the Middle East is not calmed.
"We're not moving them in a direction that protects our people or our allies. And that's dangerous," Romney wrote, referring to current policy on Iran that he says puts Israel at risk.
What is driving your vote this year? Tell us what issues matter to you
"If the Middle East descends into chaos, if Iran moves toward nuclear breakout, or if Israel's security is compromised, America could be pulled into the maelstrom," Romney wrote.
His running mate, Rep. Paul Ryan of Wisconsin, separately criticized the Obama administration's response to the September 11 attack on the consulate in Benghazi, Libya, that killed Ambassador Christopher Stevens and three other Americans.
"If this event was an isolated incident that would be tragic enough," Ryan said. "Instead, it's really indicative of a broader failure of this administration's foreign policy and the crisis that is taking place across the Middle East.
He noted the revised account of what occurred at the consulate - first described as an attack that U.S. officials thought grew out of a spontaneous demonstration against an anti-Muslim film. The intelligence community said on Friday it now believes the attack was "a deliberate and organized terrorist assault carried out by extremists" affiliated or sympathetic with al Qaeda.
"We've seen a confused, slow, inconsistent response to what is now very clearly known as a terrorist act," Ryan said in a radio interview with Laura Ingraham on Monday.
Romney will continue to focus on foreign policy and the economy heading into Wednesday's debate with Obama in Denver, according to a campaign memo obtained by CNN and campaign advisers who spoke Monday on a conference call.
"Governor Romney will, over the next few weeks, crystallize the choice for voters on the issue of foreign policy and national security," said senior adviser Kevin Madden, adding that Romney would "lay out a stronger vision for American foreign policy based on the strong leadership that we need to shape world events and protect American interests and ideals."
First on CNN: Romney campaign to unleash 'robust' spending
The Romney campaign is planning to unleash "robust" spending in the final five weeks of the presidential election, a memo provided to CNN by a Republican source says.
"We will spend as much in paid advertising, direct mail, and field operations in the next five weeks as we have spent since becoming the presumptive nominee," the memo sent out by Spencer Zwick, the campaign's National Finance Chairman and Mason Fink, the campaign's National Finance Director.
The memo comes a week after a slew of polls show Romney behind in several key swing states.
The Romney campaign has been criticized for spending time on fundraising rather and keeping a light campaign rally schedule.
Poll: horse race for presidency neck and neck
A CNN/ORC poll released Monday shows the president and Romney in a very close contest for the White House.
Asked who they would vote for today, 50% of likely voters would cast a ballot for the president whereas 47% said they would opt for Romney - the difference, 3%, is within the margin of error.
Neither candidate shows an edge on the economy, which remains the top issue on the minds of Americans and which may dominate Wednesday night's debate on domestic issues in Denver.
"The Big Choice"
Romney's campaign is characterizing the election as "The Big Choice."
In the campaign memo, the Romney camp outlined to staff and surrogates what it said was a clear choice for two different futures -- one under Romney and the other under President Barack Obama.
Under Obama, the memo said that the country would have "four more years like the last four years with a stagnant economy that fosters government dependency and a foreign policy that makes the world less safe."
Under Romney, the memo said that both the economy and the country's leadership in the world will be stronger.
"When Mitt Romney is president, our nation will have pro-growth policies that foster upward mobility -- and lift people out of poverty -- and we will ensure peace through American leadership and strength," the memo said.
Both campaigns slowed the pace of their schedules ahead of Wednesday's debate in Denver.
Obama flew West over the weekend with a rally in Las Vegas on Sunday, while Romney began the week in Boston with plans to travel to Colorado later on Monday.
A senior campaign official told CNN the president spent "some time" practicing Sunday night and then "reconvened" his sessions this morning.
Who has the 2012 campaign momentum? First on CNN: Romney memo seeks to lower debate expectations
Christie being Christie
While the Romney's campaign and its surrogates spent the better part of the week downplaying his expectations, one of his more notable campaigners went off message and predicted Romney would turn the race "upside down."
New Jersey Gov. Chris Christie said on Sunday that he expects Romney to shine when he shares the stage with Obama.
"We have a candidate who is going to do extraordinarily well on Wednesday night," Christie said on CBS' "Face the Nation." The Republican governor said Romney will have his first chance to directly contrast his vision for the country with that of Obama.
McCain: Debate will go down in history
But a majority of voters aren't expecting Romney to be victorious in the first debate.
According to an ABC News/Washington Post national poll released Monday, 55% of likely voters say they think the president will win the debate with 31% saying that Romney will come out on top.
Crowley: Memo to Chris Christie -- did you get the memo?
CNN analyst Ron Brownstein said Christie's "voice from the bleachers" reflected the campaign's dueling objectives for the debate.
"Republicans at this point do have competing and somewhat incompatible goals going into this debate," Brownstein said Monday on CNN's "Early Start." On the one hand, obviously, they don't want to overhype the expectations for what Romney can do."
On the other hand, Brownstein said the campaign needs a jump start with polls showing Romney trailing nationally and in key swing states.
CNN's Dan Lothian, Peter Hamby, Ashley Killough, Kevin Liptak, Paul Steinhauser, Rachel Streitfeld and Allison Brennan contributed to this report