US President Donald Trump said he may send more troops to the border following discussions with Republican donors at a fundraising event complaining about the influx of migrants.

The president said he would have to mobilise more of the military at the US border with Mexico, adding that some of the people crossing the border were ending up dead from the journey.

Earlier this week he announced that Homeland Security Secretary KirstjenĀ Nielsen was stepping down, citing the need for new leadership in the department that will focus on what he called a border crisis.