In a new ad, Connecticut Republican Linda McMahon is directly attacking her Senate opponent for incorrectly implying that he served in the Vietnam War.

The new spot comes just hours before the first debate between McMahon and Democratic candidate Richard Blumenthal, whose statements about his service in the war were first reported by The New York Times in May.

The spot includes a video clip of Blumenthal discussing the national reception that troops received “when we returned,” from Vietnam, suggesting that he had served overseas. It also replays a clip revealed earlier this year in which Blumenthal spoke about changes in American attitudes about war “since the days that I served in Vietnam.”

“Would you lie about serving in a war?" a narrator asks. "Dick Blumenthal did again and again. He covered one lie with another. He lied about Vietnam. What else is he lying about?"

According to the Times, Blumenthal received five military deferments between 1965-1970 and ultimately served in a Marine Reserve unit based in the United States. He has said that he has “misspoken” about his military record but that his "intention has always been to be completely clear and accurate and straightforward, out of respect to the veterans who served in Vietnam.”