Senate Majority Leader Mitch McConnell, R-Ky., praised Sen. Susan Collins, R-Maine, for her decision not to run for the Maine governor's seat and stay in the Senate, even though Collins has helped to thwart McConnell's goal of passing some kind of bill reforming Obamacare.

"Senator Collins lives up to her state motto, Dirigo, every day in the Senate," McConnell said in a statement. "She never misses votes. She fights fiercely for her constituents. She brings conviction, smarts, and leadership to every issue."

"Her decision to remain in the Senate is important not only for the people of Maine, who she serves so well, but for the nation as a whole," he added.

Since President Trump came into office, Collins has been a thorn in the side of both the administration and Republican leadership, including her vote against the "skinny" repeal of the Affordable Care Act.

During her speech Friday, she spoke extensively about the GOP efforts to reform the healthcare system while also critiquing Trump's decision to end the cost-sharing reduction payments late Thursday, calling them "very concerning."