Longtime Donald Trump strategist Boris Epshteyn’s presence at the former president’s criminal trial in Manhattan is a bizarre development, former federal prosecutor Joyce Vance told MSNBC’s Ari Melber on “The Beat” Friday — and it’s worth keeping an eye on. This comes after Epshteyn, who also spent a while performing right-wing content to send to Sinclair Broadcast Group news affiliates, was implicated in the plot to declare fake electors in battleground states to overturn the results of the 2020 election, and was one of the Trump associates indicted over the scheme in Arizona earlier this wee…