Rep. Adam Schiff Adam Bennett SchiffTop Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence Overnight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Overnight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies MORE (D-Calif.) wished former President Barack Obama Barack Hussein ObamaObama calls on Senate not to fill Ginsburg's vacancy until after election Senate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week MORE a happy birthday on Friday with a tweet implicitly criticizing his successor.

"Happy Birthday @Barack Obama. We miss your intellect and integrity in the WH, and will continue fighting to preserve your progressive legacy," Schiff wrote.

Happy Birthday @BarackObama. We miss your intellect and integrity in the WH, and will continue fighting to preserve your progressive legacy. — Adam Schiff (@RepAdamSchiff) August 5, 2017

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Schiff, who is the top Democrat on the House Intelligence Committee that is probing ties between the Trump campaign and Russia, has been one of President Trump's most vocal critics.

Trump called Schiff "sleazy" for his role in the probe in a tweet last month.

Sleazy Adam Schiff, the totally biased Congressman looking into "Russia," spends all of his time on television pushing the Dem loss excuse! — Donald J. Trump (@realDonaldTrump) July 24, 2017

The California lawmaker was among a number of Democrats to wish Obama, 56, a happy birthday on Friday.