U.S. President Barack Obama on Sunday pushed back on the notion that he feels pressure from Prime Minister Benjamin Netanyahu regarding the contentious Iranian issue, dismissing as "noise" the Israeli leader's calls for the U.S. to lay out a "red line" that Iran's nuclear program must not cross to avoid American military intervention.

"When it comes to our national security decisions, any pressure that I feel is simply to do what's right for the American people," Obama told CBS' 60 Minutes, in an interview aired the night before he was to meet with other world leaders at the United Nations. "And I am going to block out any noise that's out there."

In the interview, Obama defended his foreign policy record at a time of anti-American rage in the Muslim world, firing back at suggestions from Republican nominee Mitt Romney that the president has been weak with allies and enemies alike.

"If Gov. Romney is suggesting that we should start another war, he should say so," he told CBS.

It was Obama's most direct rebuttal yet to persistent skepticism by his White House rival on his handling of an unraveling situation in the Middle East. Romney has charged the U.S. stance has been marred by miscalculation, mixed messages and appeasement.

As far back as May, Romney was condemning Obama's response to unrest in Syria, dubbing it a "policy of paralysis" and calling for more assertive measures, such as arming the opposition to Syrian President Bashar Assad. As deadly anti-American protests erupted earlier this month in Libya and elsewhere, Romney sought to undercut what polling shows is a significant foreign policy edge for Obama by calling the president's handling of the situation "disgraceful" and decrying a lack of U.S. leadership in the region.

In a companion interview to Obama's appearance on CBS' "60 Minutes," Romney broadened his reproach to include Israel, criticizing Obama's failure to meet with the U.S ally's head of state, Benjamin Netanyahu, during the annual UN gathering. Romney called it a mistake that "sends a message throughout the Middle East that somehow we distance ourselves from our friends."

In a wide-ranging interview, conducted the day after U.S. Ambassador to Libya Chris Stevens was killed in an attack in Benghazi, Obama defended his foreign policy successes, noting he'd followed through on a commitment to end the war in Iraq and had nabbed al-Qaida leader Osama bin Laden.

He also waxed optimistic that winning a second term would give him a mandate to overcome obstructionism from congressional Republicans whose No. 1 goal, he said, has been to prevent his re-election.

"My expectation is, my hope is that that's no longer their number one priority," Obama said. "I'm hoping that after the smoke clears and the election season's over that that spirit of cooperation comes more to the fore."

Romney, in an interview conducted last week, sought to deflect attention from his running mate, Wisconsin Rep. Paul Ryan, over their differences in Medicare policy: "I'm the guy running for president, not him."

While reaffirming his commitment to lowering all income tax rates by 20 percent, Romney expressed no unease about his refusal to offer specifics, such as which loopholes and deductions he'd eliminate to pay for the cuts.

"The devil's in the details. The angel is in the policy, which is creating more jobs," Romney said, adding that he doesn't want to see overall government revenue reduced.

Addressing the seemingly unshakable charge of flip-flopping on policy issues, Romney pointed the finger at Obama, noting his changes of heart on gay marriage and military tribunals for terrorism suspects.

"Have I found some things I thought would be effective turned out not to be effective? Absolutely," Romney said. "You don't learn from experience, you don't learn from your mistakes why, you know, you ought to be fired."

The "60 Minutes" interviews came as Romney's campaign strove to turn the page on a week of public stumbles and Republican hand-wringing, promising a redoubled effort in the most competitive states to undercut Obama's economic record as voters tune in for the final six weeks of a deadlocked race.

A secretly recorded video released last Monday showed Romney writing off his prospects for winning over the almost half of Americans who he said pay no taxes, are dependent upon government and see themselves as victims dominated the week. Ahead of an evening campaign stop at a Denver-area high school Sunday, Romney huddled with senior advisers in Los Angeles to rehearse for the three upcoming presidential debates, which his aides see as the best opportunity to get his campaign and its message back on track.

Amid mounting pressure to spend less time raising money and more time explaining his plans to voters, Romney was refocusing his schedule on the most competitive states. After Colorado, Romney was to begin a three-day bus tour in Ohio on Monday followed by a stop in Virginia, states that Obama won in 2008 but that Republicans claimed four years earlier.

The president is not chosen by popular vote but by state-by-state elections, making states such as these that are neither predominantly Democrat or Republican extremely important in such a tight race.

While national polls remain tight, polls in several of the most closely watched states, including Colorado, suggest Obama has opened narrow leads. Obama won Colorado by 9 points four years ago, but the state went to a Republican in the previous three presidential elections.