Rep. Ted Lieu (D-Calif.) vowed late Sunday to resist any "unconstitutional crazy s---" from President-elect Donald Trump.

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"I just became a monthly donor to @ACLU. Because the RESISTANCE to any unconstitutional crazy shit from 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 begins now," he tweeted.

I just became a monthly donor to @ACLU. Because the RESISTANCE to any unconstitutional crazy shit from President Trump begins now. — Ted Lieu (@tedlieu) November 14, 2016

The American Civil Liberties Union (ACLU) has received more than 33,000 online donations totaling more than $1.9 million since Trump won the presidential election last Tuesday, according to Forbes

“It’s the most we have ever seen in that time period,” an ACLU representative told Forbes.

The ACLU last week issued a warning to Trump should he implement his most controversial policies: "We'll see him in court.

"If you do not reverse course and instead endeavor to make these campaign promises a reality, you will have to contend with the full firepower of the ACLU at every step."