We knew that the bomb attacks that stalked New York and New Jersey in recent days would feed into the Presidential race. Let's call it the politics of terror.

But to understand just how low the debate can go, just look at this tweet from Donald Trump Jr., his father's closest adviser.

It reveals how immigration, America's refugee policy and Presidential politics have become linked in the eyes of Team Trump. Out of terrorism they see opportunity.

Cynical. But will it be effective?

We will know on November 8th. But between now and Election Day expect Trump to relentlessly exploit the anxiety of Americans, not least during the first Presidential debate next Monday.

Skittles' parent company Wrigley Americas distanced itself from the tweet with a devastatingly simple response to Trump Jr.

Skittles are candy. Refugees are people. We don't feel it's an appropriate analogy. We will respectfully refrain from further commentary as anything we say could be misinterpreted as marketing.

Denise Young, VP of Corporate Affairs, Wrigley Americas

Others took to social media with their own response to the analogy.

Some used the argument to highlight the issue of gun ownership: