U.S. Sen. James Lankford said Monday that he would oppose the resolution to reverse President Donald Trump’s emergency declaration on border security.

“I am not going to support the disapproval resolution,” Lankford, R-Oklahoma City, said during a telephone town hall meeting.

Lankford had been undecided on the resolution, which is expected to come up for a vote this week in the Senate. The House, controlled by Democrats, approved the resolution two weeks ago by a vote of 245-182.

Several Senate Republicans are expected to vote with Democrats, and the resolution is expected to be approved easily in the GOP-controlled Senate. However, Trump is expected to veto the resolution, and the House is not likely to have the votes to override the veto.