Senator Susan Collins from the great state of Maine.
Senator Susan Collins published an op-ed in the Washington Post last night. U.S. Senate

Collins's op-ed begins:

I will not be voting for Donald Trump for president. This is not a decision I make lightly, for I am a lifelong Republican.

Will she support the first female major-party candidate for president?

Seems doubtful. She says she does not "support" either major party candidate. But she never mentions Clinton by name, and spends all of her time laying into Trump. "I have become increasingly dismayed by his constant stream of cruel comments and his inability to admit error or apologize," she writes.

"Mr. Trump lacks the temperament, self-discipline and judgment required to be president," she adds.

And: "Mr. Trump’s lack of self-restraint and his barrage of ill-informed comments would make an already perilous world even more so."

She's not alone in thinking that. Yesterday, the New York Times broke the story that 50 prominent Republican national security experts have also denounced Trump:

Fifty of the nation’s most senior Republican national security officials, many of them former top aides or cabinet members for President George W. Bush, have signed a letter declaring that Donald J. Trump “lacks the character, values and experience” to be president and “would put at risk our country’s national security and well-being.”

Mr. Trump, the officials warn, “would be the most reckless president in American history.”

You can read a pdf of their letter here.

Weirdly enough, there is one Bush who's come out in favor of Trump, and it's Jeb! ("It connotes excitement") Bush's son, of all people. As the Texas Tribune reported over the weekend, George P. Bush made his feelings known in front of a roomful of Texas GOP activists.

Bush said it was time to put aside any lingering animosity from the primaries — where Trump defeated Bush's dad, former Florida Gov. Jeb Bush, among others — and get behind Trump.

"From Team Bush, it's a bitter pill to swallow, but you know what? You get back up and you help the man that won, and you make sure that we stop Hillary Clinton," Bush said.

Here's video of this lone wolf making his views known: