President Trump on Thursday turned his attention to "unmasking and surveillance" in the Obama administration, calling it the "big story."

"The big story is the 'unmasking and surveillance' of people that took place during the Obama Administration," Trump tweeted Thursday.

The big story is the "unmasking and surveillance" of people that took place during the Obama Administration. — Donald J. Trump (@realDonaldTrump) June 1, 2017

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Trump's comments come after the House Intelligence Committee on Wednesday issued seven new subpoenas in its investigation into Russian interference in the 2016 election.

Three of the subpoenas focus on allegations of improper "unmasking" of Trump campaign officials, The Wall Street Journal reported.

Those three subpoenas went to the CIA, FBI and National Security Agency and are related to questions — primarily from Republicans — about how the names of Trump associates were un-redacted and distributed in classified Obama administration reports during the transition period.

Republicans have signaled they see unmasking as the key to investigating the source of media leaks damaging to the Trump administration.

Trump and his aides have often railed against the leaking of information to the media and Trump has blasted the Russia probe as a "witch hunt."