US president Donald Trump
US president Donald TrumpReuters

The Wall Street Journal editorial board on Thursday called on US president Donald Trump to resign, blaming him for inciting the storming of the US Capitol building on Wednesday by a mob of his supporters.

The conservative-leaning newspaper's editorial board said Trump must resign now to avoid being impeached by the US House of Representatives for a second time, even though Trump only has 13 days until he leaves the White House.

“In concise summary, on Wednesday the leader of the executive branch incited a crowd to march on the legislative branch,” the editorial board said, referring to Trump urging supporters to march to the US Capitol to protest against Congress certifying Democrat Joe Biden's presidential election win.

“It was also an assault on the legislature from an executive sworn to uphold the laws of the United States. This goes beyond merely refusing to concede defeat. In our view it crosses a constitutional line that Mr. Trump hasn’t previously crossed. It is impeachable.”