Menendez Convicted Unlike Trump

Senator Menendez was convicted of bribery while serving as senator, unlike former President Trump who was not convicted of crimes related to his performance in office. Trump was convicted of some minor crimes by kangaroo courts in New York, but he has not been convicted of trying to overthrow the 2020 election or compomizing classified documents at his Mar-a-Lago mansion. Why has the justice system operated successfully in the case of Menedez, but not Trump? Clearly there is something wrong with our justice system.