Illinois Sen. Mark Kirk rescinded his previous endorsement of Trump and Senate Majority Leader Mitch McConnell was blunt in his criticism of Trump; "I think it's time for him to look like a serious candidate for president," McConnell told a crowd at the American Enterprise Institute on Tuesday afternoon.

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That night Trump delivered an obviously pre-written speech using the very same TelePrompTers he had so maligned in the campaign to date. It was meant to send a message to the likes of McConnell and Speaker Paul Ryan. That message? I get it. I can change.

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The problem for Trump is that there's very little evidence that he can stick to a plan to be slightly more low key, project more gravitas-- in a word to be more "presidential." Within 48 hours he was slamming Sen. Elizabeth Warren as "Pocahontas," a hit at the fact that she referred to herself as being of Native American lineage in staff directories while working at the University of Pennsylvania and Harvard. (This was a giant deal during Warren's 2012 Senate campaign against Scott Brown.)

That set off another round of worry within Republican circles -- with GOP Senators bobbing and weaving rather than answer the question none of them could have even imagined might come up a month ago: "Is Donald Trump a racist?"

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And, to finish it all off, Mitt Romney, who was huddled with major donors and political types this week in Park City, crushed Trump in a CNN interview Friday night. “I don’t want to see trickle-down racism,” Romney said of his decision not to endorse or vote for Trump. “I don’t want to see a president of the United States saying things which change the character of the generations of Americans that are following."

Trump ended this week much like he started it -- unrepentant. "I am the least racist person," he insisted to the Post's Marc Fischer.

Unfortunately for Trump, many in his party remain unconvinced.