One of former Secretary of State Hillary Clinton’s top critics throughout the 2016 presidential election was former National Security Adviser Michael Flynn.

>> Michael Flynn resigns: 5 things to know

Flynn was an early surrogate of President Donald Trump and a frequent guest on Republican-leaning Fox News programs. At the 2016 Republican National Convention, Flynn led the crowd in chants of “lock her up” due to allegations that Clinton mishandled classified information via a private email server. Flynn and his son, Michael Flynn Jr., also made references to the debunked “pizza-gate” conspiracy theory, whose proponents falsely claim that a family pizza parlor in Washington, D.C., is the home of a child-sex ring run by Democrats.

>> National Security Adviser Michael Flynn resigns

On Monday night, Flynn learned that Clinton doesn't forget.

Following Flynn’s late-night resignation, Clinton’s official Twitter account subtweeted a longtime aide who seemed quite pleased.

>> Read: Flynn cites calls with Russian ambassador in resignation letter

"Dear Mike Flynn & Mike Flynn Jr., What goes around COMETS around. And given your pizza obsession… https://jobs.dominos.com/dominos-careers/ … xo Philippe," Philippe Reines wrote.

His pun about “COMETS” is a direct reference to the “pizza-gate” theory, which centered on a pizzeria called Comet Ping Pong.

>> Sally Yates reportedly warned White House that Flynn was ripe for Russian blackmail

On her own account, Clinton made quick reference to Reines’ tweet.

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“Philippe’s got his own way of saying things, but he has a point about the real consequences of fake news…” Clinton wrote.

>> See the tweet here