Bernie Sanders is making his latest fundraising pitch by using a photograph of Hillary Clinton smiling up at Donald Trump that was snapped when she attended his wedding to Melania in 2005.

The Sanders email, signed by campaign manager Jeff Weaver and carrying the subject line “Trump,” does not elaborate on the photo. It notes that “no matter what the Clinton campaign says, there is one candidate in this race Donald Trump said would make a great president” – meaning Clinton.

Weaver also writes that Clinton allies are accusing Sanders supporters of helping Trump by prolonging the Democratic primary.

The Sanders email arrives on a day when the Republican presidential primary leader provacatively wrote on Twitter that Sanders “has been treated terribly by the Democrats” and should run as an Independent.

Sanders faces increasingly long odds in the Democratic primary, with Clinton ahead of him both in pledged delegates awarded to state contest winners and in “super delegates” who also weigh in.