Why are election experts taking Trump’s midterm threats seriously?

With the midterm elections just months away, President Donald Trump has been telegraphing his intent to dominate on election night, despite not personally being on the ballot. Whether threatening that the GOP could “take over the voting in at least 15 places” or insinuating that he might deploy Department of Homeland Security forces to polling locations, Trump and his aggressive posturing have caught the attention of candidates, party officials and electoral experts on both sides of the aisle.