The Republicans claim Donald Trump did nothing wrong because both he (the accused) and Volodymyr Zelensky (the person being extorted, so essentially had a gun pointed at his head) said there was no pressure to investigate Joe Biden. But as multiple witnesses (yes, including several first hand witnesses) have testified under oath, there was plenty of explicit pressure. Trump was using his official power as president to extort assistance from a foreign country for his own personal gain.
That is a massive swamp, and an illegal one at that. I guess the GOP is so desperate for excuses that easily disproved lies are all they have left to try.