Pity poor Republicans. They have only one argument left to defend Donald Trump for abusing the powers of the presidency by inviting a foreign power to intervene in an American election, the one transgression our Founding Fathers feared most. Even now that he's covered in disgrace as only the third president in our history to be impeached, it's all they've got left.
After all, they can't say Trump didn't ask the president of Ukraine to investigate his likely political opponent, because Trump admits he did. They can't deny it was a quid pro quo, because Ambassador Gordon Sondland, Trump's man in Ukraine, testified under oath it was.