Republican presidential front-runner Donald Trump said Sunday he is open to running for president as an independent if he concludes Republicans are not treating him fairly.

He made his comments on ABC’s “This Week” when asked about a Wall Street Journal story first published online Friday that reported an effort by Republican establishment figures to unite to knock Mr. Trump out of the race. The group plans a “guerrilla campaign” backed by secret donors to “defeat and destroy” the celebrity businessman’s candidacy, the Journal reported.