Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE slammed West Virginia Sen. Joe Manchin Joseph (Joe) ManchinManchin defends Supreme Court candidate Barrett: 'It's awful to bring in religion' The Hill's Morning Report - Sponsored by Facebook - Trump, GOP allies prepare for SCOTUS nomination this week Trump meets with potential Supreme Court pick Amy Coney Barrett at White House MORE on Friday over the Democratic senator's timing in announcing his support for President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's Supreme Court nominee Brett Kavanaugh.

The president's eldest son noted that Manchin's announcement came moments after Sen. Susan Collins Susan Margaret CollinsClub for Growth to spend million in ads for Trump Supreme Court nominee Maryland's GOP governor says Republicans shouldn't rush SCOTUS vote before election The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November MORE (R-Maine) signaled her support for Kavanaugh, giving him the necessary votes to win confirmation.

"A real profile in courage," Trump Jr. wrote mockingly of Manchin, whom he dubbed a "lyin’ liberal."

"I bet he had another press release ready to go if Collins went the other way," Trump Jr. added while calling on followers to support Manchin's GOP challenger, West Virginia Attorney General Patt Morrissey.

A real profile in courage from Lyin’ liberal @JoeManchinWV. Waited until Kavanugh had enough votes secured before he announced his support. I bet he had another press release ready to go if Collins went the other way.



West Virginia - Vote for #MAGA champion @MorriseyWV! #WVSEN https://t.co/WDAzKcb3Io — Donald Trump Jr. (@DonaldJTrumpJr) October 5, 2018

Republicans had for weeks put pressure on Manchin, who represents a state President Trump won by 42 points in 2016, to support Kavanaugh. Manchin, who is the only Democrat to support Kavanaugh, was joined by two other Democrats last year in voting for Trump's first nominee to the Supreme Court, Neil Gorsuch.

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Manchin told reporters that he made his decision about Kavanaugh's nomination Friday morning, but "out of respect" did not issue his statement announcing his decision until Collins delivered her speech.

"I saw that Sen. Collins — I wanted to, out of respect, I wanted to watch her give hers ... and then I made my decision and I gave my reasons for my decision," Manchin said in an interview with CNN's Manu Raju.

The Senate is slated to hold a final vote on Kavanaugh's nomination on Saturday, capping off weeks of controversy after multiple women came forward to accuse him of sexual misconduct stemming from his days in high school and college in the 1980s.

Kavanaugh has fiercely denied the allegations, and the FBI launched a days-long investigation into sexual assault allegations against the nominee.

Several GOP senators on Thursday who remained publicly undecided on his nomination said the investigation did not corroborate allegations against him, while Democrats blasted the investigation as inadequate.