Former House Speaker Newt Gingrich says President-elect Trump should allow federal officials to investigate Hillary Clinton after Trump said he’s leaning against prosecuting his old opponent.

Gingrich said on Fox News Wednesday that Trump’s statements could be as damaging to the rule of law as his earlier promises to lock Clinton up for her use of a private email server while in office. He said Trump should not tell the Federal Bureau of Investigation or the Internal Revenue Service what to do.