WASHINGTON (AP) — President Barack Obama will veto a Republican bill on Tuesday that would have approved construction of the Keystone XL oil pipeline.

The bill arrived at the White House from Congress on Tuesday morning. The White House says Obama will veto it by the end of the day. It’s the third veto of Obama’s presidency.

The move puts a freeze on a top GOP priority, at least temporarily. It also reasserts Obama’s authority over a project that’s become a flashpoint in the national debate about climate change.

Republicans may try to override Obama’s veto, but they haven’t yet shown they can muster the necessary two-thirds majority in both chambers. Republican Sen. John Hoeven of North Dakota says Republicans are about four votes short in the Senate and 11 votes short in the House.