Donald Trump campaigns in Wisconsin, where he faces perhaps his toughest anti-Trump effort yet.
- Donald Trump reverses stance in abortion controversy
- Ted Cruz is up by 10 percentage points in a new poll of Wisconsin primary voters
- Trump's campaign manager, Corey Lewandowski, is charged with battery after an encounter with a reporter this month
- A union that represents Border Patrol agents has endorsed Trump's campaign
- Tell us: What do you think of Trump?