Jeffrey Donaldson
The shock announcement has rocked Northern Ireland politics.
Could power-sharing at Stormont finally be restored after two years of delays and boycotts?
His comments are a major blow for the prime minister.
"They need to get back in," Rishi Sunak said.
What you need to know as polls suggest Sinn Fein is close to a milestone in its quest for a united Ireland.
The five things you need to know about politics today
Northern Ireland party propping up Theresa May says agreement looks unlikely.
The DUP are driving a hard bargain but Scotland and Wales might not be happy.