Eight-term U.S. Rep. Darrell Issa (R-Vista) is in a tight race with first-time candidate Doug Applegate that has been rated a toss-up by political handicappers.
Issa, who turns 63 today, endorsed Donald Trump in May.
"Darrell appreciates the birthday shout out after he spent the day riding his bike across the district, meeting with voters and working to ensure our veterans get their bonuses paid back in full," said Issa spokesman Calvin Moore.
Democrats think that Issa's strong support of Trump will hurt him in November. Applegate's campaign manager, Robert Dempsey, jabbed at Issa and Trump's relationship shortly after the tweet.
"Darrell Issa once again shows why he's unfit to represent this district in Congress. When he's not busy lining his own pockets, he's trying to score political brownie points with one of the least qualified candidates for president in the history of the United States," he said in a statement. "I guess Issa couldn't help himself in showing the voters of this district that he really is a mini-Trump who will always put party before country."
1:51 p.m.: Updated with responses from the Issa and Applegate campaigns.
This post was originally published at 12:09 p.m.