Obama's day: Prime time on Syria

President Obama explains his Syria policy Tuesday to probably the biggest audience he will have.

Obama will deliver a prime-time speech on his case for military action against Bashar Assad's government, following a full day of lobbying with various members of Congress.

"I'll explain this is not Iraq; this is not Afghanistan; this is not even Libya," Obama told PBS during one of six television interviews conducted Monday. "We're talking about a very specific set of strikes to degrade his chemical weapons capabilities in terms of delivery."

Obama also said Monday he would pursue a diplomatic proposal from Russia, which says it will ask its ally Assad to put his chemical weapons under international control.

The Syria speech is set for 9 p.m. ET Tuesday.

Earlier in the day, Obama will travel to Capitol Hill for separate meetings with Senate Republicans and Democrats.

Given the new diplomatic track — and the fact that Obama may not have enough support in Congress — the Senate postponed a vote that had been scheduled for Wednesday.

The Republican-run House has no votes on Syria scheduled.