Reacting to a parade of Republican lawmakers who have been making themselves available at Donald Trump’s hush money trial to boost his spirits and complain about the legal system holding him to account, a former head of the Republican National Committee was baffled by why they are humiliating themselves instead of staying on the sidelines. From his perch as a co-host of MSNBC’s “The Weekend,” Michael Steele went on an extensive rant while pointing out to his former GOP colleagues that Trump would throw them under the bus the moment he didn’t need them. Speaking with Sarah Matthews, a former Tr…