President Donald Trump marked his 100th day in office with a rally in Warren, Michigan, on Tuesday, where he touted his immigration crackdown, defended his economic record, attacked judges blocking his agenda and dismissed polls showing his approval rating at near-record lows as “fake.”

Presidential job approval ratings are one of the few metrics consistently and similarly measured in nearly all major public polls. An average of recent polls can often paint a more reliable picture of how the public views the president than a single poll can.