The first thing the MAGA folks would do is expose Manchin's shady background regarding the coal industry. He (and his daughter) have some skeletons in his closet...
Admittedly Casten comes from the progressive wing of the Dem Party.. But the reality is if Trump felt threatened MAGA would not hesitate to amplify these charges...
"The truth is, Manchin is best understood as a grifter from the ancestral home of King Coal. He is a man with coal dust in his veins who has used his political skills to enrich himself, not the people of his state. He drives an Italian-made Maserati, lives on a houseboat on the Potomac River when he is in D.C., pals around with corporate CEOs, and has a net worth of as much as $12 million.
More to the point, his wealth has been accumulated through controversial coal-related businesses in his home state, including using his political muscle to keep open the dirtiest coal plant in West Virginia, which paid him nearly $5 million over the past decade in fees for coal handling, as well as costing West Virginia electricity consumers tens of millions of dollars in higher electricity rates (more about the details of this in a moment). Virginia Canter, who was ethics counsel to Presidents Obama and Clinton, unabashedly calls Manchin's business operations "a grift." To Canter, Manchin's corruption is even more offensive than Donald Trump's. "With Trump, the corruption was discretionary — you could choose to pay thousands of dollars to host an event at Mar-a-Lago or not," Canter tells me. In contrast, Manchin is effectively taking money right out of the pockets of West Virginians when they pay their electric bills. They have no say in it. "It's one of the most egregious conflicts of interest I've ever seen."
The Official U.S. Congressional website of Congressman Sean Casten
casten.house.gov