Hillary Clinton offered some of her sharpest criticisms of Donald Trump on Thursday, accusing him of bigotry - but few Republicans have come to the defence of the Republican nominee.
Last summer, Donald Trump could do no wrong. What a difference a year makes.
While the general election is often described as an exercise in appealing to as many voters as possible, candidates are never one to neglect a niche audience.
In the 2016 presidential campaign, the line between fringe theory and stump speech material is blurring, on the subject of Hillary Clinton's health.
What motivates his supporters?
Will Trump's Hispanic problem damage the party?
How the two sides of America see each other
Did 'socialism' save this conservative town?
Who would be the most progressive president?
Would Cruz or Trump be more radical?
Five reasons why US voters are so fed up