TRUMP STARTED VICIOUSLY ATTACKING BARACK AND MICHELLE OBAMA IN 2011. BUT ON INAUGURATION DAY 2017 OBAMA STILL PERFORMED HIS PRESIDENTIAL DUTIES BY WELCOMING THE NEXT PRESIDENT TO THE WHITE HOUSE! THE 2021 INAUGURATION DAY WAS THE FIRST TIME SINCE 1869 THAT THE SITTING PRESIDENT DIDN’T WELCOME THE NEW PRESIDENT!