Former New Jersey Gov. Chris Christie (R) on Tuesday said President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE does not give nicknames to people he respects because “he’s afraid what’s going to come back.”

Christie spoke at the Manhattan home of hedge fund billionaire Steven Cohen on Tuesday to a crowd that included Trump’s former economic adviser Gary Cohn Gary David CohnGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Former national economic council director: I agree with 50 percent of House Democrats' HEROES Act MORE and New York Times reporter Maggie Haberman, Axios reported.

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He told the group to keep an eye out on which Democrat candidates get nicknames in 2020.

"If he respects you, you don’t get a nickname, because he’s afraid what's going to come back,” Christie said of Trump.

The former New Jersey governor said an example of this is Trump’s relationship with Congress’s top Democrats, Senate Minority Leader Charles Schumer Chuck SchumerSenate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' Jacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee MORE (N.Y.) and House Speaker Nancy Pelosi Nancy PelosiPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare House lawmakers reach deal to avert shutdown Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill MORE (Calif.).

“So Cryin’ Chuck Schumer Chuck SchumerSenate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' Jacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee MORE gets a nickname, because [Trump] has no respect for Schumer,” Christie said.

“But Nancy Pelosi’s got no nickname. It’s just Nancy. And if she doesn’t have a nickname by now, she ain’t getting any,” he added.

Trump has been using nicknames and insults to taunt his political opponents since the 2016 Republican presidential primary, tagging former Florida Gov. Jeb Bush (R) as “low energy” and Sen. Marco Rubio Marco Antonio RubioOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Democrats step up hardball tactics as Supreme Court fight heats up Press: Notorious RBG vs Notorious GOP MORE (R-Fla.) as “Little Marco.”

The president still uses the moniker “Crooked Hillary” to attack his former Democratic opponent, Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE.

Trump frequently goes after Sen. Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE (Mass.), who is running for president in 2020, over her past claims of Native American heritage, calling her “Pocahontas."

Christie, a close ally of the president, was an early supporter of Trump after ending his own 2016 campaign. He was fired after Election Day as the chief of Trump’s transition team.

The New Jersey Republican has been promoting his new book “Let Me Finish: Trump, the Kushners, Bannon, New Jersey, and the Power of In-Your-Face Politics.”

He criticizes several of Trump's ex-Cabinet secretaries and advisers in the book, calling them “amateurs,” “weaklings” and “unconnected felons.”