President Obama is canceling his trip to California next week to focus on rallying congressional support for a military strike on Syria, the White House announced on Thursday.

Obama was slated to travel to Los Angeles on Monday to speak at an AFL-CIO meeting and a Democratic fundraiser.

The White House is furiously trying to corral the votes needed on Capitol Hill to authorize U.S. military action in Syria to punish President Bashar Assad for using chemical weapons.

But the call for a measure authorizing the use of force faces a growing chorus of liberal Democratic and libertarian-leaning Republican opposition.

The president has been working the phones, even at the G-20 summit in Russia, trying to win over skeptical lawmakers.

The Senate Foreign Relations Committee on Wednesday approved a narrow resolution authorizing U.S. military action against Syria.

The White House called the development a "step forward," while awaiting the outcome of deliberations in the House.