(CNBC) — President Donald Trump attacked the late Sen. John McCain in a series of weekend tweets over his role in a dossier that contains unverified claims about the president’s ties to Russia.

The president’s comments sparked wide backlash both from McCain’s family and Republicans who worked with the former Arizona lawmaker. Trump has long railed against the 2008 GOP presidential nominee and Vietnam prisoner of war, even after his death in August.

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