"Original Sin" co-author and Axios reporter Alex Thompson told MSNBC on Sunday that there needs to be "investigative reporting" on President Donald Trumps health after being "untransparent" about his records.In light of several revelations about an alleged cover-up of former President Joe Bidens health in Thompsons book, "The Weekend: Primetime" co-host Ayman Mohyeldin asked him whether there is now a "double standard" in coverage for Bidens health compared to Trumps."And, certainly now, is there a double standard with the way we are covering it? I mean, are you out there also investigating and reporting about Trumps health in the same rigor that you did this book?" Mohyeldin asked.'ORIGINAL SIN' CO-AUTHOR EXPOSES 'FRANTIC EFFORTS' TO HIDE BIDEN'S COGNITIVE DECLINEThompson said that while they knew little about Bidens health at the time, they knew "even less" about Trumps."He was completely untransparent during the 2023-2024 campaign," Thompson said. "He has not been transparent since, and there is no mechanism forcing him or any future president to be transparent about their health. He could be on anything. We really have no idea. So I think its a really vital question."He added that he has covered the lack of transparency from Trump in the past and considered the subject "completely fair.""Donald Trump was older on his inauguration day than Joe Biden was on his. Donald Trumps health is completely fair game, and there should be incredibly investigative reporting on how its affecting his job as president," Thompson said.CNN host and Thompsons co-author Jake Tapper also claimed on Thursday that Trump has not been forthcoming about his health while promoting his book on CNN."When it comes to the president, President Trump, while he appears healthy, he has not been transparent about his health records," Tapper said. "And I think that thats something that the American people have a right to."CLICK HERE FOR MORE COVERAGE OF MEDIA AND CULTUREAs he faced criticism for taking part in what many believe was an alleged media cover-up of Bidens health, Tapper went on to insist there needed to be more force when it comes to reporting on the president."I just think in general, not Trump specific, but in general, I think that the press corps, and Im certainly including myself, needs to worry less about politeness when it comes to these health issues and needs to be even more aggressive when it comes to demanding transparency on health issues," Tapper said.CLICK HERE TO GET THE FOX NEWS APP