From 538.com:
"Collins has voted against President Trump more than any other Republican senator so far. While she has still voted with Trump’s position most of the time (85 percent), she’s the only GOP senator to vote with Trump less than 90 percent of the time so far. She was the lone Republican to vote against two of Trump’s Cabinet nominees (Betsy DeVos for secretary of education and Scott Pruitt for secretary of the EPA). And she was the only Republican to vote against the repeal of the stream protection rule for mining, even as some Democrats voted for it."