US President Donald Trump intensified his vilification of four female democratic politicians as “un-American” at a rally in North Carolina on Wednesday.

Trump singled out Ilhan Omar, a Somali refugee and one of the first two Muslim women to be elected to Congress, allowing a chant of "Send her Back" to grow.

Will this controversy stick and affect his 2020 chances or will it be forgotten like the many others?

We ask Stephen Moore, Economist at The Heritage Foundation and Economic Adviser to the Trump 2020 Campaign.