Barack Obama,

President Obama will speak to the nation Tuesday as he builds a case for military intervention in Syria.

FOX News Radio's Mike Majchrowitz reports from the White House.

(President Obama) "I knew this was going to be a heavy lift."

President Obama said he had no illusions about the difficulty of convincing Congress to support military action. And with public opinion running against -- the President plans an address to the nation Tuesday night. But he's not predicting a sea change.

(President Obama) "It's conceivable that at the end of the day, I don't persuade a majority of the American people that it's the right thing to do."

And asked if he would act even if Congress votes no -- the President was evasive.

(President Obama) "You're not getting a direct response."

A Senior House Republican official frets the President's Tuesday night address might be too late -- saying this was the critical week to win over public and Congressional support.

At the White House, Mike Majchrowitz, FOX News Radio.

WATCH President Obama's news conference in Russia:

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