WASHINGTON: US President Donald Trump has launched a scathing attack on the media during a rally marking 100 days in office.

He told supporters in Pennsylvania that he was keeping "one promise after another", dismissing criticism as "fake news" by "out of touch" journalists.

Mr Trump decided to skip the White House Correspondents' Dinner - the first US leader to miss the event since an injured Ronald Reagan in 1981.

Mr Trump's approval ratings hover at around the 40% mark - believed to be lower than any other president at the 100-day marker.

At the rally in Harrisburg, the president said the media should be given "a big, fat, failing grade" over their coverage of his achievements during his first 100 days and told the cheering crowd he was "thrilled to be more than 100 miles from Washington".

He quipped that at the same time "a large group of Hollywood actors and Washington media are consoling themselves" at the correspondents' dinner "that will be very boring".