WASHINGTON — US President Donald Trump celebrated "the greatest political journey in human history" in a Fourth of July commemoration before a soggy but cheering crowd of spectators, many of them invited, on the grounds of the Lincoln Memorial. Supporters welcomed his tribute to the US military while protesters assailed him for putting himself center stage on a holiday devoted to unity.

As rain fell on him, Trump called on Americans to "stay true to our cause" during a program that adhered to patriotic themes and hailed an eclectic mix of history's heroes, from the armed forces, space, civil rights and other endeavors of American life.

He largely stuck to his script, avoiding diversions into his agenda or re-election campaign. But in one exception, he vowed, "Very soon, we will plant the American flag on Mars," actually a distant goal not likely to be achieved until late in the 2020s if even then.