He’s all in on MAGA, mean tweets and all. Sen. Mike Lee (R-UT), who peddled false flag claims post-Jan. 6, says he’s endorsing former President Donald Trump to become the next GOP nominee and ultimately the 47th president just days before Iowans brave the bone cold to caucus. “I just endorsed Donald Trump,” he tweeted. “Whether you like Trump or not, Americans face a binary choice.” POLL: Should Trump be allowed to run for office? He continued: “Biden refuses to enforce our border, prosecutes his opponents, & embraces policies that make life unaffordable for hardworking Americans. I’ll take th…