President Obama warned the U.S. Supreme Court that striking down his administration's health care law would be judicial activism.

During last week's 'Obamacare' hearings, conservative justices on the court had tough questions for the government's lawyer over the mandate that Americans purchase health coverage.

The grilling has led to speculation the court might strike down part, if not all of the law.

But the president said he doesn't think that will happen.

"Ultimately, I'm confident that the Supreme Court will not take what would be an unprecedented extraordinary step of overturning a law that was passed by a strong majority of a democratically elected Congress," he said.

Obama has also taken heat for an open mic gaffe where he gave assurances to Russia's president that he would have more "flexibility" on the issue of missile defense after the U.S. presidential election.

GOP presidential candidate Mitt Romney pounced, saying the president had no business making such remarks to "our number one geopolitical foe."

But administration officials say Romney's reaction shows he's out of touch on foreign relations issues.

"He acts like he thinks the Cold War is still on, Russia is still our major adversary," Vice President Joe Biden told CBS News. "This is not 1956. We have disagreements with Russia, but they're united with us on Iran."