Trump: The key to Republican success is more Trumpism

President Donald Trump affirmed his commitment to the Republican Party in a closed-doors speech to donors on Saturday night (Evan Vucci/AP)

Former US president Donald Trump has said his populist policies and attack-dog politics are the key to the Republican Party’s future success.

In a closed-doors speech to donors at his Mar-a-Lago resort on Saturday night, he also reinforced his commitment to the party, according to prepared remarks obtained by the Associated Press.