A 68-year-old Florida man was arrested for allegedly making online threats against former President Donald Trump less than a week after he survived an assassination attempt at a campaign rally. Michael Martin Wiseman, of Jupiter, was charged Friday with a felony count of written death threats against Trump, who Republicans nominated this week to challenge President Joe Biden. Wiseman is a registered Democrat, according to online records. Multiple tipsters reportedly alerted authorities to posts on Wiseman’s Facebook page in which he allegedly made threats against Trump, his running mate, Ohio …