Lieu trolls Trump with 'warning' to foreign powers on office door

Rep. Ted LieuTed W. LieuDemocrats call for restraint, oversight as Trump reportedly calls back Iranian strike Report: Iranian officials say Trump warned them attack was imminent Trump approved Iranian strike before pulling back: report MORE (D-Calif.) is using a new sign posted outside his Capitol Hill office to swipe at President TrumpDonald John TrumpConway defends herself against Hatch Act allegations amid threat of subpoena How to defuse Gulf tensions and avoid war with Iran Trump says 'stubborn child' Fed 'blew it' by not cutting rates MORE for his recent comments about accepting political dirt on his opponents from a foreign entity.

The California congressman, a frequent critic of Trump, tweeted a photo of the new sign, which reads: "If you are a foreign power and you try something shady, we'll report you to the FBI."

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The jab comes in response to Trump's comments earlier this week that he wasn't sure he'd call the FBI if a foreign power offered damaging information on a political opponent. 

"I think maybe you do both," Trump told ABC's George StephanopoulosGeorge Robert StephanopoulosTrump to appear on 'Meet the Press' for first time as president Trump shows off Air Force One model in Oval Office The Hill's 12:30 Report — Presented by MAPRx — Tensions flare after Iran shoots down US drone MORE when asked whether he would alert the FBI, or listen if Russia, China or another foreign government reached out to his campaign with intelligence on an opponent.

"I think you might want to listen. There’s nothing wrong with listening," Trump said in the interview. "It’s not an interference. They have information. I think I’d take it. If I thought there was something wrong, I’d go maybe to the FBI."

The question comes after special counsel Robert MuellerRobert (Bob) Swan MuellerKamala Harris says her Justice Dept would have 'no choice' but to prosecute Trump for obstruction Dem committees win new powers to investigate Trump Schiff says Intel panel will hold 'series' of hearings on Mueller report MORE's final report, released earlier this year, detailed numerous efforts by Russia to interfere in the 2016 election. As part of his probe, Mueller investigated Donald Trump Jr.Donald (Don) John TrumpDemocrats seek to ban federal spending at Trump businesses Republicans, Trump Jr. signal support for embattled West Virginia governor The Hill's Morning Report — US strikes approved against Iran pulled back MORE's meeting at Trump Tower with a Russian lawyer who had promised damaging information on the president’s Democratic opponent, Hillary ClintonHillary Diane Rodham ClintonThe Hill's Morning Report - Crunch time arrives for 2020 Dems with debates on deck The Memo: All eyes on faltering Biden ahead of first debate Trump says he's not prepared to lose in 2020 MORE.

Among those who have criticized Trump's comment to Stephanopoulos is the chair of the Federal Election Commission, who said Thursday that not reporting such an incident to the FBI is illegal.

"Let me make something 100 percent clear to the American public and anyone running for public office: It is illegal for any person to solicit, accept, or receive anything of value from a foreign national in connection with a U.S. election," Chairwoman Ellen Weintraub said.