Boehner reportedly set to announce Clinton email probe
© Greg Nash

Speaker John Boehner (R-Ohio) is poised to announce an investigation into Hillary ClintonHillary Diane Rodham ClintonFarrow: Clinton staff raised concerns over Weinstein reporting Perry says Trump directed him to discuss Ukraine with Giuliani: report The Memo: Once the front-runner, Biden now vulnerable MORE's use of private email as secretary of State, ABC News reported Sunday, citing unidentified top House Republicans.

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ABC said Boehner is expected to announce the investigation this week.

The probe could signal that Republicans intend to make the issue a centerpiece of their attacks on Clinton, as she moves to officially unveil her expected 2016 Democratic presidential bid.

Rep. Trey Gowdy (R-S.C.), the chairman of the House Select Committee on Benghazi, said on "Fox News Sunday" that the full House could vote to subpoena Clinton's emails.

"There are lots of ways to motivate people," Gowdy said, mentioning public pressure to have Clinton turn over her server to an independent arbiter.

"Otherwise the House, as an institution, may be forced to go to court to try to get access to them," he said.

Last week, House Oversight Committee Chairman Jason Chaffetz (R-Utah) hinted in a statement at potential hearings over Clinton's use of private email, emphasizing his panel's jurisdiction over violations of the Federal Records Act.

“I’d rather not have to subpoena her, but if she’s fully cooperative, there wouldn’t be a need,” Chaffetz told The Wall Street Journal. “Are we prepared to do so if necessary? I suppose so. We’re going to get to the bottom of this.”

Republicans have seized on Clinton's admission during a press conference last week that she deleted more than 30,000 "personal" emails from her time as secretary of State, from 2009 through 2013.

Clinton and her allies note that she has turned over 55,000 pages of emails to the Department of State for archiving, though questions still surround the security of her email system and the scope of official emails preserved.