THINGS I'D LIKE TO LEARN ABOUT BURISMA.

I keep hearing, from Republicans, of how concerned Trump was about corruption in Ukraine, because of BURISMA  hiring Hunter Biden to be a member of its Board.  Trump was in office for 60% of the time Hunter was serving on that Board but never showed the slightest concern until his father decided to run for office, in 2019 five years after.   How come Trump was unconcerned when Paul Ryan was the Speaker of the House of Representatives, or when Bill Barr became head of the DOJ?