Democratic Rep. Ilhan Omar told CNN that President Trump's phone call with Ukraine's president was "the straw that broke the camel's back" for the House deciding to move forward with an impeachment inquiry.
"This particular incident shows that the President clearly thinks he's above the law. He is withholding aid so he can pressure a foreign country to dig dirt on a potential presidential opponent. That is very unconstitutional and we must hold him responsible," Omar said.
Calls for an impeachment inquiry have grown louder amid a growing controversy over Trump's July 25 call with Ukrainian President Volodymyr Zelensky where he discussed former Vice President Joe Biden.
Of the 235 Democrats in the House, there are at least 172 who've made clear they support starting the impeachment inquiry process, while some have gone further, according to a CNN count.