A Democratic lawmaker trolled President Trump on Friday after reports that former National Security Adviser Michael Flynn could testify against Trump in the Russia probe.

Rep. Jared Huffman Jared William HuffmanOVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' COVID-19 complicates California's record-setting wildfire season Congress should investigate OAS actions in Bolivia MORE (D-Calif.) retweeted an ABC News report about the special counsel charges against Flynn, adding a line that suggested he thinks Trump will be impeached.

“Let me be the first to congratulate President Pence,” Huffman tweeted.

Let me be the first to congratulate President Pence. https://t.co/t3vphY2gAj — Rep. Jared Huffman (@JaredHuffman) December 1, 2017

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Flynn pleaded guilty Friday morning to one charge of lying to the FBI about his meetings with the Russian ambassador during the presidential transition.

ABC News reported Friday that Flynn is prepared to testify against Trump and the Trump family, including that Trump “directed him to make contact with the Russians,” news that could move the investigation closer to Trump personally.

Flynn is the fourth person affiliated with the Trump campaign to be indicted in special counsel Robert Mueller’s investigation into whether the Trump campaign colluded with Russia to win the 2016 election, and the first who has held formal office in the administration.