Let's get back to the original point.
President Trump retweeted videos from a UK far right group. The videos were supposedly all of Muslims, however, at least one is unsubstantiated as a Muslim and was definitely not a migrant. One was probably Muslim as this took place in Egypt and the murder was of another Muslim and the murderer was caught and hanged. The third was the smashing of a Christian (specifically Catholic) icon in Syria (a Muslim country).
The videos were posted by Britain First specifically to rile up hate against Muslims in the UK.
Trump had no good reason for retweeting these and should have apologised for doing so rather than attacking the British PM for saying that he was wrong to retweet far right propaganda.