Trump calls Dem candidates 'clowns,' claims none can defeat him in 2020

President TrumpDonald John TrumpMost Americans break with Trump on Ukraine, but just 45 percent think he should be removed: poll Judge orders Democrats to give notice if they request Trump's NY tax returns Trump's doctor issues letter addressing 'speculation' about visit to Walter Reed MORE asserted in an early morning tweet on Wednesday that none of the Democratic presidential contenders could defeat him in the 2020 general election and that House Democrats are trying to “illegally” impeach him as a result.

“You would think there is NO WAY that any of the Democrat Candidates that we witnessed last night could possibly become President of the United States. Now you see why they have no choice but to push a totally illegal & absurd Impeachment of one of the most successful Presidents!” Trump tweeted.

Trump called the Democratic candidates "clowns" and claimed the economy would crash if any of them were elected next year.

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Trump’s messages marked his first reaction to the fourth Democratic presidential debate Tuesday night, during which many of the candidates trained their attacks on Sen. Elizabeth WarrenElizabeth Ann WarrenRahm Emanuel: Bloomberg, Patrick entering race will allow Democrats to have 'ideas primary' Feehery: Pivoting to infrastructure could help heal post-impeachment wounds Jayapal hits back at Biden on marijuana 'prohibition' MORE (D-Mass.), who has been rising in the polls.

Impeachment was the first topic discussed at the outset of the debate, with several candidates outlining their support for impeaching Trump.

Trump has lashed out at House Democrats’ impeachment inquiry, claiming his political opponents are seeking to overturn the results of the 2016 presidential election. Trump has taken aim Speaker Nancy PelosiNancy PelosiFeehery: Pivoting to infrastructure could help heal post-impeachment wounds Key GOP senator: 'We need a breakthrough' on spending talks Overnight Defense — Presented by Boeing — Stopgap spending bill includes military pay raise | Schumer presses Pentagon to protect impeachment witnesses | US ends civil-nuclear waiver in Iran MORE (D-Calif.) and other top congressional Democrats in addition to his potential 2020 opponents during official White House events, campaign rallies and on Twitter.

Meanwhile, some recent polls have shown Warren or former Vice President Joe BidenJoe BidenMost Americans break with Trump on Ukraine, but just 45 percent think he should be removed: poll Democrats release two new transcripts ahead of next public impeachment hearings Press: Ukraine's not the only outrage MORE defeating Trump in hypothetical general election match-ups.

House Democrats last month launched an impeachment inquiry focused on Trump’s contacts with Ukraine after it was revealed that he asked the nation's leader to investigation Biden and his son. An anonymous intelligence community whistleblower filed a complaint alleging Trump was using his official office to solicit foreign interference in the 2020 election.

Trump has maintained he did nothing wrong on the call, saying it was focused on fighting "corruption" and not politics. No evidence of criminal wrongdoing related to the Bidens has emerged.

The president has also accused Democrats of a “witch hunt” — using a moniker he often reserved to describe former special counsel Robert MuellerRobert (Bob) Swan MuellerSpeier says impeachment inquiry shows 'very strong case of bribery' by Trump Gowdy: I '100 percent' still believe public congressional hearings are 'a circus' Comey: Mueller 'didn't succeed in his mission because there was inadequate transparency' MORE’s Russia investigation.

The White House has refused to cooperate with the impeachment inquiry, accusing Democrats of neglecting due process and fairness by refusing to hold a formal vote to begin impeachment proceedings, among other things.

Vice President Pence, the Pentagon and Trump's personal attorney Rudy GiulianiRudy GiulianiDemocrats release two new transcripts ahead of next public impeachment hearings GOP senator calls impeachment 'sabotage' effort, raises questions about witness on eve of testimony Impeachment guide: The 9 witnesses testifying this week MORE — a key person of interest in the impeachment inquiry — all refused to comply with subpoenas for documents in connection with the impeachment inquiry on Tuesday.

Updated at 9:15 a.m.