These Hollywood Stars Are Livid at Trump's 'Disgraceful' Meeting with Putin at 'Treason Summit'
The UK Takes Trump Protests to the Next Level

"You've just seen the most disgraceful performance by a U.S. president," says Anderson Cooper, and a lot of celebrities seem to agree.

Donald Trump and Vladimir Putin are together again and Hollywood is not happy about it.

Celebrities slammed the meeting between the President of the United States and Russia's president Monday morning. Josh Gad, Bette Midler, Judd Apatow, Piper Perabo, Rob Reiner, and Rosie O'Donnell took to Twitter to rip the meeting.

There were not one, but three hashtags trending on Monday: #TreasonSummit, #TrumpPutin, and #Helsinki, which was the city in Finland where the summit took place.

Before the meeting, which went past the scheduled 90 minutes, Trump tweeted about the upcoming summit and blamed poor relations with Russia on the U.S. government before he was in power and the ongoing U.S. intelligence investigation into illegal Russian interference in the 2016 election.

"Our relationship with Russia has NEVER been worse thanks to many years of U.S. foolishness and stupidity and now, the Rigged Witch Hunt!" he wrote.

The tweet and subsequent meeting came after Robert Mueller filed an indictment on Friday charging 12 Russian intelligence operatives with conspiracy to interfere with the 2016 presidential election. Special counsel Mueller alleged the dozen Russian agents named in the indictment attempted to hack into the Democratic National Committee, the Democratic Congressional Campaign Committee, and Hillary Clinton's campaign.

The Ministry of Foreign Affairs of Russia even commented that they "agreed" with the U.S. president's tweet. While Perabo posted a photo of the tweet saying she was "dumbstruck" over the message.

At the Finnish presidential palace, Trump stressed that the U.S. has been "foolish" with their relationship with Russia, while Putin insisted that he "never interfered" in the 2016 election. In a particularly stunning moment, President Trump suggested he trusts Putin more than U.S. intelligence agencies that have found overwhelming evidence Russia meddled in the last presidential election.

"I have great confidence in my intelligence people, but I will tell you that President Putin was extremely strong and powerful in his denial today," Trump said.

"I think we have great opportunities together as two countries that, frankly, we have not been getting along very well for the last number of years," Trump said at another point during the press conference. "I think we will end up having an extraordinary relationship."

Although the meeting was focused on mending the relationship between the countries -- which Trump believes will happen -- Hollywood didn't hesitate to bring up the Mueller and Russia investigation, Trump's unusually close relationship with Putin, and the 2016 election. In addition, stars participated in the #TreasonSummit hashtag, slamming Trump's bromance with the Russian president.

"Right now, a KGB trained operative who's been President of Russia for close to 20 years and who every intelligence angency said undermined our election is alone in a room with the host of 'Celebrity Apprentence.' What could possibly go wrong?" Gad tweeted.

Chelsea Handler joked that Trump needed to stop "blowing" his "boyfriend," and defended Trump's predecessor Barack Obama.

"[Obama] didn't believe it could happen, and it did happen," she wrote. "He did not stop them, so by taking no action whatsoever, you are carrying on the legacy of your favorite president, Barack Obama. While you're blowing your boyfriend Putin at your summit, know that evil villains fall hardest.

Even "The Ellen DeGeneres Show" executive producer Andy Lassner weighed in, tweeting that "the idiots are out in droves today," and that Trump is a "traitor" after someone wrote that they considered Trump an American "patriot."

At the end of the press conference, CNN's Anderson Cooper called the president's performance "disgraceful."

"You've just seen the most disgraceful performance by a U.S. president," he said.

Check out the celeb reactions below.

Covfefe Forever Getty/Twitter Trump Twitter Fails: 15 Times Trump Used 'Alternative Spelling' for His 'Alternate Facts'