Republican strategist Steve Schmidt said Sunday that 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 “beclowned himself” and disgraced the United States at the Group of Seven (G-7) summit.

“From his slovenly appearance to his unpreparedness, ignorance and arrogance, he beclowned himself,” tweeted Schmidt, one of the loudest GOP critics of Trump. “The Republican majority is filled with cowards who are servile supplicants to the most unfit POTUS ever.”

TRUMP disgraced the Presidency and the United States at the G-7 summit. From his slovenly appearance to his unpreparedness, ignorance and arrogance, he beclowned himself. The Republican majority is filled with cowards who are servile supplicants to the most unfit POTUS ever — Steve Schmidt (@SteveSchmidtSES) June 10, 2018

Schmidt, a former aide to Sen. John McCain (R-Ariz.) and an MSNBC analyst, also called Russian President Vladimir Putin “the greatest intelligence agent —ever” in a separate tweet.

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“He has engineered the unraveling of the western alliance, fidelity to democracy in the United States and the severing of the [United Kingdom] from the [European Union]. It’s a remarkable achievement,” he tweeted of Putin.

I think it’s time we give Vladimir Putin his due. He is clearly the greatest intelligence agent —ever . He has engineered the unraveling of the western alliance, fidelity to democracy in the United States and the severing of the UK from the EU. It’s a remarkable achievement — Steve Schmidt (@SteveSchmidtSES) June 10, 2018

Schmidt has been highly critical of Trump and his administration. Earlier this year, he compared Trump’s staff to monkeys "hurling their excrement at each other."

Trump made headlines on Friday when he called for Russia to be readmitted to the G-7, after being removed over the annexation of Crimea. Other world leaders in the group rejected the proposal.

Trump also refused to back a joint communique issued by the participating nations at the end of the summit, and slammed Canadian Prime Minister Justin Trudeau as “very dishonest & weak.”

Based on Justin’s false statements at his news conference, and the fact that Canada is charging massive Tariffs to our U.S. farmers, workers and companies, I have instructed our U.S. Reps not to endorse the Communique as we look at Tariffs on automobiles flooding the U.S. Market! — Donald J. Trump (@realDonaldTrump) June 9, 2018