President Donald Trump reportedly has brought up the notion of prosecuting his former election rival, Democrat Hillary Clinton, a few times since entering office.

Trump talked publicly about the idea throughout his campaign for the White House, and chants like “lock her up” took off among many supporters.

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But that began to subside when he finally entered office.

Yet behind the scenes, that conversation apparently continued, and he even asked Department of Justice officials about it, according to reports.

The president raised the subject with Deputy Attorney General Rod Rosenstein, according to a CNN report on Tuesday.

Trump also asked Matt Whitaker, who was serving as chief of staff to former Attorney General Jeff Sessions at the time, and is now the acting attorney general.

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Former White House counsel Don McGahn was reportedly asked by the president to inquire about prosecuting Hillary Clinton through the Justice Department, but he refused. The New York Times uncovered similar information that the president asked about prosecuting Clinton and former FBI Director James Comey last spring.

Trump and his allies have questioned Clinton’s conduct during the presidential election of November 2016. Her use of a private email server while secretary of state for official government business became the main issue raised by critics. The FBI investigated her — and Comey, very controversially, decided that she acted carelessly but that nothing was worth pursuing legally.

The House Judiciary Committee and House Oversight and Government Reform Committee in response launched a joint investigation last year into the Department of Justice and FBI. Investigators have been reviewing decisions made by the agencies during the presidential election.

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The investigation has also been looking into what led to the special counsel’s investigation into Russian interference.

Trump himself has also been the subject of an investigation related to the presidential election. Special counsel Robert Mueller has been leading the longtime investigation, which has been looking into whether the president or his associates colluded with Russian interests during the campaign.

Sessions was also pushed by the president to look into whether Hillary Clinton’s misdeeds called for further investigation. The Daily Wire reported that he pushed back on the idea of appointing a special counsel to oversee such a probe.

The Justice Department informed House Judiciary Committee Republicans that he directed senior federal prosecutors to evaluate certain issues such as the email controversy, her approving the sale of Uranium One, and alleged illegal Clinton Foundation dealings.