By Eileen Sullivan 

WASHINGTON — President Trump appeared to break with his own administration’s policy on Friday, saying that he was likely to support a legislative proposal to leave the decision to states about whether to legalize marijuana.

Mr. Trump was asked about a new bill introduced by Senator Cory Gardner, Republican of Colorado, and Senator Elizabeth Warren, Democrat of Massachusetts.

“We’re looking at it. But I probably will end up supporting that, yes,” Mr. Trump said to reporters as he departed Washington to attend the Group of 7 summit meeting in Canada.

Mr. Trump’s view is in stark contrast to measures his administration took this year, freeing federal prosecutors to more aggressively enforce federal laws against the use of marijuana in states that have decriminalized it.