Besides stating that Jones would be "WEAK on crime" - despite Jones having prosecuted the KKK - Trump is also labeling the Democrat as a "Schumer/Pelosi puppet" who will raise taxes and be bad for the military.
"I endorsed Luther Strange in the Alabama Primary", Trump wrote.
Thune said, however, if Moore wins his race "there's going to immediately be an ethics investigation which is going to be a cloud that he'll be operating in". "Liberal Jones would be BAD!"
Moore's campaign has been crippled in recent weeks by a string of sexual misconduct allegations brought by women who say Moore either groped them, molested them, or pursued relationships with them when they were teenagers and he was in his 30s.
He was referring to Democrat Doug Jones, who is running against Moore to fill the Senate seat left open when Trump named Jeff Sessions attorney general.
Many members of Trump's Republican Party have withdrawn support for Moore, with some Republicans suggesting that Moore is elected to the US Senate, he should be removed.
Every other high-profile Republican in Washington recoiled from Moore's candidacy, including Vice President Mike Pence and the president's daughter Ivanka Trump.
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"Do you believe this?" he asked aides in the Oval Office after his daughter spoke out about Moore, according to The New York Times.
In an interview with John Catsimatidis on AM 970 in New York, Ms McDaniel said the claims against Mr Moore are concerning - but that Alabama officials have maintained he can not be replaced on the ballot. Trump also apparently "vented" his annoyance at Ivanka to several advisers.
Her words quickly became part of Jones' campaign ads in Alabama.
The "moral of the story", Graham said, "is: Don't nominate somebody like Roy Moore, who could lose a race any other Republican could win". It ends with the line, "Will we make their abuser a USA senator?"
Barkley, who made the remarks to reporters before the Alabama-Auburn football game, added that the backing from Bannon should have "disqualified Roy Moore way before this women stuff came up". But he still has the endorsement of much of Alabama's Republican establishment. The former judge has vehemently denied all the allegations against him.
Several Republicans have denounced Moore and called for him to exit the race, but President Trump has declined to distance himself from the Senate candidate.