While Donald Trump has boasted that he has quickly unified the Republican Party rumblings within the GOP are re-emerging about a stop Trump movement at the convention. Despite Trump’s best efforts to appear disciplined and presidential on Tuesday night the damage may have already been done among some delegates who find him unfit for the presidency.

Just as Republicans were starting to wrap their heads around a Trump nomination, Trump’s support began to unravel in the wake of offensive comments he made about the ethnicity of the judge in charge of the Trump University case. Criticism came from those even within his own party such as Newt Gingrich, Paul Ryan, and Marco Rubio. His language caused Sen. Mark Kirk, Sen. and Sen. Jeff Flake to publicly rescind their endorsement of the billionaire businessman and Sen. Lindsey Graham called for other senators to do the same. The media and detractors wasted no time in glomming onto Trump’s comments.

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Trump clearly heard the message loud and clear and on Tuesday night tried to correct course through appearing tamed and on message. Trump needed to make the transition from an undisciplined candidate in a large primary field to a disciplined nominee for the party. Undoubtedly, Trump’s speech is exactly what those within party leadership and those on the fence about his candidacy needed to see in order to know that he would focus his efforts on Clinton rather than wading in the weeds of his words. But despite his change of course, some Republicans just aren’t convinced he’s up for the job and able to carry the mantle of the Republican Party.

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Bette Grand, an unbound delegate who headed up the Cruz campaign in North Dakota and has no made up her mind, stressed the importance of unbound delegates to CNBC. “We do not allow the media to pick the candidates,” Grand said. “It’s up to the delegates. The process is not over. It finishes at the convention. We are all unbound. We vote our conscience and until then we have to wait and see what the credentials, platform and rules committee lays out rules, we have to wait.”

Others are calling for another nominee to replace Trump at the GOP convention. Conservative radio host Hugh Hewitt said on radio show that he believes the party ought to change the nominee because “we’re going to get killed with this nominee.”

Rumors are starting to swirl that Scott Walker could potentially become a viable option at the convention because of comments he made on a local TV station in Wisconsin. “He [Trump] is not yet the nominee,” Walker said. “Officially that won’t happen until the middle of July and for me that’s kind of the timeframe.” Walker had previously said that he would support Trump if he were the nominee, but Walker walked away from his support of Trump after his offensive comments. “It’s just sad in America that we have such poor choice right now,” Walker said.

It is unclear what will happen in Cleveland at the convention if the sentiment among anti-Trump delegates continues to grow, but one thing is for certain there is no official alternative to Trump — at least not yet.