Milwaukee County Sheriff David Clarke (D) ripped the "lib left" on Sunday for "politicizing" Hurricane — now Tropical Storm — Harvey. He sent a string of attack tweets a few hours after President Trump promoted Clarke's book in a tweet.

"The deranged lib left is soiling their underwear in excitement over politicizing Tropical Storm Harvey to use against @realdonaldtrump. MAGA," Clarke tweeted.

The deranged lib left is soiling their underwear in excitement over politicizing Tropical Storm Harvey to use against @realDonaldTrump. MAGA pic.twitter.com/zDTHYNua6l — David A. Clarke, Jr. (@SheriffClarke) August 27, 2017

Clarke went on to compare Trump's response to Harvey favorably to former President Obama's response to past flooding in the southeastern U.S.

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Clarke — a staunch Trump ally who previously claimed to be under consideration for a role in his administration — was active on Twitter not long after Trump promoted Clarke's book "Cop Under Fire: Moving Beyond Hashtags of Race, Crime and Politics for a Better America" earlier on Sunday.

"A great book by a great guy, highly recommended!" the president tweeted along with the book's link on Amazon.

A great book by a great guy, highly recommended! https://t.co/3jbDDN8YmJ — Donald J. Trump (@realDonaldTrump) August 27, 2017

Trump's tweet came even as Texas copes with extreme flooding and the effects of Harvey, in which five fatalities have been reported so far.

The tweet quickly drew backlash online.

Or you could instead spend that money helping victims of Harvey



Here's how: https://t.co/u3w8dfeGa8 https://t.co/hb6Iubtbja — Jake Tapper (@jaketapper) August 27, 2017

What hurricane? What devastation? What catastrophic flooding? #PINTO (President in Title Only), staying true to form. Happy Sunday, America. https://t.co/xcjpmkG0no — Ana Navarro (@ananavarro) August 27, 2017

Amid vast destruction in Texas, the first public thing Trump did today was endorse a book by Sheriff Clarke. https://t.co/HC66Nv3Ral — Jim Roberts (@nycjim) August 27, 2017

Trump has also tweeted updates on the storm throughout the weekend and continued to do so on Sunday.

Closely monitoring #HurricaneHarvey from Camp David. We are leaving nothing to chance. City, State and Federal Govs. working great together! — Donald J. Trump (@realDonaldTrump) August 26, 2017

Going to a Cabinet Meeting (tele-conference) at 11:00 A.M. on #Harvey. Even experts have said they've never seen one like this! — Donald J. Trump (@realDonaldTrump) August 27, 2017

Trump spent a busy Sunday morning online, also tweeting his grievances on the North American Free Trade Agreement (NAFTA) negotiations, renewing his call for Mexico to pay for his proposed border wall and slamming Sen. Claire McCaskill Claire Conner McCaskillMomentum growing among Republicans for Supreme Court vote before Election Day Democratic-linked group runs ads in Kansas GOP Senate primary Trump mocked for low attendance at rally MORE (D-Mo.) ahead of her 2018 Senate reelection bid.