U.S. Congressman Jake Auchincloss of Massachusetts called Greek Prime Minister Kyriakos Mitsotakis’ speech to a joint session of Congress on Tuesday “the best he’s heard” and posted a video on Twitter to share his praise.

“The Greek prime minister’s address was the best speech I’ve heard as a member of Congress,” Auchincloss wrote. “He said that Greeks and Americans are custodians of democracy — we must stand up to disinformation and threats from within that cripple our institutions.”

House Speaker Nancy Pelosi had welcomed Mitsotakis to the Capitol on Tuesday for the prime minister to give an address reflecting on 200 years of partnership between Greece and the United States.

“I bring you here today the pledge of the Greek people: that we stand together with the people of the United States – whenever and wherever necessary – to ensure that the hopes our ancestors bequeathed to the world 25 centuries ago will endure, and the dream of freedom for every human being on this planet will never die,” Mitsotakis told members of Congress during his speech.

Throughout his speech, Mitsotakis spoke about the shared relationship between Greece and the United States, as the founding of the American republic drew from the ideals and philosophy of Athenian democracy.

Auchincloss said he left the room feeling “truly inspired and motivated” to continue his work as a U.S. Representative.

Click here to watch his video.