For President Biden, marking the 90th anniversary of D-Day in France is an opportunity to be commander in chief and statesman while hailing the nonagenarian American veterans who liberated Europe from Nazi Germany.

For his campaign, it is another opportunity to whack former President Donald J. Trump.

The Biden campaign on Thursday released a digital advertisement featuring three veterans who attended a White House event last month in New Hampshire at which the president announced that his administration had approved more than one million claims from veterans injured by toxic exposures during their service.

The three men each denounced Mr. Trump as “a draft dodger,” unfit to be commander in chief and someone who has had “zero accountability in his life” — an awkwardly timed claim one week after the former president was found guilty on 34 felony counts in his Manhattan hush-money trial.

The Biden campaign said the ad will run as part of the $14 million of advertising it announced in early May.