Draw the line

I don't mind if they have some fun, but I draw the line at anything that might harm others.

By contrast, the British government draws the line at giving the Community a significant new role in setting minimum standards on working conditions, labor representation on corporate boards, and social affairs.

We are at a moment right now where people are asking themselves why can’t the Democratic Party defend this assault on democracy[…] and I would submit to you that if you can’t draw the line at genocide, you probably can’t draw the line at democracy.