Donald Trump-Hillary Clinton

Khizr Khan told a rapturous crowd that his son Humayun had sacrificed his life to save those of his fellow soldiers.

If it had been up to Mr Trump, he said, his son would not have been in America.

Mr Khan asked if Mr Trump had "even read the United States Constitution", and offered to lend him his copy.

Appearing on stage in Philadelphia with his wife, Mr Khan, 65, paid tribute to their son who was killed by a car bomb in 2004 at the age of 27.

Each platform outlines what the parties believe in, but we already know where the presumptive nominees stand on some of the issues.

There are some areas where they differ wildly — Donald Trump wants to deport immigrants, Hillary Clinton wants to support them to stay.

On other issues their views are more closely aligned - both have questioned the benefit of free trade deals and called for raising incomes for the middle class.

Here are summaries of each of the presumptive nominees' positions on five major issues:

Immigration

The clash between Donald Trump and the forces supporting Hillary Clinton played out on Twitter and social media Tuesday, underscoring a certainty about the fall campaign -- nothing will be off limits.

In this case, it was Priorities USA Action, the well-funded super PAC supporting Clinton, which served as instigator to Trump's stream of insults for the former first couple.