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President Trump snuck in a dig at GOP Senator Jeff Flake, calling him "weak" on crime and border security, while thanking Phoenix for the "amazing" crowd that came out to watch his speech last night.

This isn't the first time Trump has gone after Flake on Twitter. Last week, Trump tweeted that he was "toxic" and signaled his support for Flake's opponent in the 2018 Senate race, Dr. Kelli Ward.

The Trump-Flake ongoing feud initially began when Flake openly opposed Trump during his presidential campaign. He also sharply criticized Trump and condemned the Republican Party for enabling Trump's rise to the presidency in his book, "The Conscience of a Conservative." Trump's recent flurry of tweets attacking Flake is the president's way of retaliating.

Go deeper

In photos: D.C. and U.S. states on alert for pre-inauguration violence

National Guard troops stand behind security fencing with the dome of the U.S. Capitol Building behind them, on Jan. 16. Photo: Kent Nishimura / Los Angeles Times via Getty Images

Security has been stepped up in Washington, D.C., and state capitols across the U.S. as authorities brace for potential violence this weekend.

Driving the news: Following the Jan. 6 insurrection at the U.S. Capitol by some supporters of President Trump, the FBI has said there could be armed protests in D.C. and in all 50 state capitols in the run-up to President-elect Joe Biden's inauguration Wednesday.

The new Washington

Illustration: Sarah Grillo/Axios

The Axios subject-matter experts brief you on the incoming administration's plans and team.

Rep. Lou Correa tests positive for COVID-19

Lou Correa. Photo: Tom Williams/CQ-Roll Call, Inc via Getty Images

Rep. Lou Correa (D-Calif.) announced on Saturday that he has tested positive for the coronavirus.

Why it matters: Correa is the latest Democratic lawmaker to share his positive test results after last week's deadly Capitol riot. Correa did not shelter in the designated safe zone with his congressional colleagues during the siege, per a spokesperson, instead staying outside to help Capitol Police.

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