U.S. Sen. Dick Durbin has cancelled a Tuesday luncheon appearance before Chicago's business and political elite to head to Washington and begin preparing for congressional debate on possible action in Syria.
The No. 2 Senate Democrat was among the 15 members of Congress briefed last week in a call on the situation.
President Barack Obama said he'll seek congressional approval for military strikes against the Assad regime. He's trying to rally support among Americans and congressmen.
Durbin's spokeswoman didn't immediately return a Monday message seeking comment.
Durbin was to speak about sentencing for non-violent drug offenders Tuesday before the City Club of Chicago. His office issued a notice Monday that as a member of Senate leadership and the Senate Foreign Relations Committee, he'll be in Washington preparing for debate instead.
He said last week that any involvement needs to be "carefully thought out," with a goal of avoiding a ground war.
Both Gov. Pat Quinn and 2014 Democratic challenger Bill Daley said they agree with Obama's approach to the situation in Syria.
The Associated Press contributed to this report.