At the risk of sounding presumptuous, I am going to presume there will be a trial in the U.S. Senate over the impeachment of Donald John Trump.

So, assuming the start of such a trial, I am compelled to ask: What in the world has happened to Sen. Lindsey Graham? Who captured this man’s brain and his heart and what have they done with either part of the senator’s body?

You see, Sen. Graham once was a House of Representatives manager sent into the Senate to prosecute another president over obstruction of charges. The House impeached President Clinton in1998 for lying to a grand jury about an affair he was having with a White House intern. Graham was a young House whippersnapper who insisted at the time that there be witnesses called and evidence heard in the Senate.

Then the South Carolina Republican got elected to the Senate. He’s now on the other side of the great partisan divide. A Republican president stands accused of abuse of power and obstruction of Congress. Graham’s position on witnesses? He doesn’t want to hear anything. He don’t need no stinkin’ witnesses. Nor does he need to hear any other evidence. He’s made up his mind. Done deal. The impeachment is a “sham,” he said, a partisan fishing expedition led by House Speaker Nancy Pelosi.

Holy smokes, man! He was right two decades ago in calling for witnesses for Bill Clinton’s trial. He is wrong now in saying witnesses aren’t necessary for Donald Trump’s pending trial.

In the annals of political flip-flops, this one might rank as No. 1 of all time.