The Justice Department “must finally act” against a longtime senior aide to Hillary Clinton and former FBI Director James Comey, President Donald Trump tweeted, his latest fiery social media post to kick off 2018.

Trump and his team have an ambitious agenda for the new year, especially considering more than 400 House seats and 30 Senate seats are up for grabs in just 11 months. But the president on Tuesday focused his morning tweets at his domestic political and geopolitical foes.

In one tweet, Trump targeted Clinton confidant Huma Abedin, Comey and the Justice Department, which has frustrated the chief executive with its investigation of possible ties between the Kremlin and his 2016 presidential campaign.

He wrote that “Crooked Hillary Clinton’s top aid [sic], Huma Abedin” allegedly violated security protocols, an apparent reference to her handling of State Department emails when Clinton ran that agency for former President Barack Obama. Trump charged on Tuesday that Abedin “put Classified Passwords into the hands of foreign agents.”

It was not immediately clear to what the president was referring, but conservative websites and Fox News in recent days have posted items stating that Abedin forwarded State Department passwords to a Yahoo account before many were hacked.