Donald Trump, who once joked that avoiding STDs was “his personal Vietnam” and who reportedly dodged the draft with the assistance of a doctor who was his father’s tenant, took to Twitter early Monday to launch another attack on Connecticut Sen. Richard Blumenthal. The Democrat and frequent Trump critic—a Marine Reservist who served in the U.S. from 1970 to 1976—famously apologized after implying, during his 2010 Senate campaign, that he’d served in Vietnam during the war. Trump tweeted: “I have now spent more time in Vietnam than Da Nang Dick Blumenthal, the third rate Senator from Connecticut (how is Connecticut doing?). His war stories of his heroism in Vietnam were a total fraud—he was never even there. We talked about it today with Vietnamese leaders!” Ahead of his second summit with Kim Jong Un, Trump praised the host country, saying: “Vietnam is thriving like few places on earth. North Korea would be the same, and very quickly, if it would denuclearize. The potential is AWESOME, a great opportunity, like almost none other in history, for my friend Kim Jong Un. We will know fairly soon - Very Interesting!” Trump also lashed out at his critics, saying: “The Democrats should stop talking about what I should do with North Korea and ask themselves instead why they didn’t do “it” during eight years of the Obama Administration?”