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Roy Moore and President Trump. Photos: Joe Raedle/Getty Images; Charly Triballeau/Pool/Getty Images

President Trump said he won't support a 2020 Senate run by Alabama's Roy Moore in a pair of Wednesday tweets.

Why it matters: The possibility that Moore may launch another run for the seat is worrying Republican leaders who fear his candidacy could damage the GOP's chances to win it back from Democratic Sen. Doug Jones, who is considered one of the most vulnerable incumbent senators in the 2020 cycle.

What Trump is saying:

"Republicans cannot allow themselves to again lose the Senate seat in the Great State of Alabama. This time it will be for Six Years, not just Two. I have NOTHING against Roy Moore, and unlike many other Republican leaders, wanted him to win. But he didn’t, and probably won’t. If Alabama does not elect a Republican to the Senate in 2020, many of the incredible gains that we have made during my Presidency may be lost, including our Pro-Life victories. Roy Moore cannot win, and the consequences will be devastating....Judges and Supreme Court Justices!"

The backdrop: Moore lost former Attorney General Jeff Sessions' seat in a 2017 special election after 4 women accused him of inappropriate touching and making sexual advances toward them when they were underage.

Go deeper: Roy Moore considers another Senate run in Alabama

Go deeper

Microwave energy likely behind illnesses of American diplomats in Cuba and China

Personnel at the U.S. Embassy in Cuba in Havana in 2017, after the State Department announced plans to halve the embassy's staff following mysterious health problems affecting over 20 people associated with the U.S. embassy. Photo: Sven Creutzmann/Mambo photo/Getty Images

A radiofrequency energy of radiation that includes microwaves likely caused American diplomats in China and Cuba to fall ill with neurological symptoms over the past four years, a report published Saturday finds.

Why it matters: The National Academies of Sciences, Engineering, and Medicine's report doesn't attribute blame for the suspected attacks, but it notes there "was significant research in Russia/USSR into the effects of pulsed, rather than continuous wave [radiofrequency] exposures" and military personnel in "Eurasian communist countries" were exposed to non-thermal radiation.

Georgia governor declines Trump's request to help overturn election result

Georgia Gov. Brian Kemp. Photo: Elijah Nouvelage/Getty Images

Georgia Gov. Brian Kemp pushed back on Saturday after President Trump pressed him to help overturn the state's election results.

Driving the news: Trump asked the Republican governor over the phone Saturday to call a special legislative session aimed at overturning the presidential election results in Georgia, per the Washington Post. Kemp refused.