NASHVILLE, TENNESSEE (REUTERS) - US President Donald Trump on Tuesday (May 29) criticised Mexico for not helping to stop the flow of illegal immigrants into the United States and repeated his campaign promise that Mexico will pay for building a wall along the US-Mexico border.

"In the end, Mexico is going to pay for the wall," Mr Trump told supporters at a campaign-style rally in Nashville, Tennessee.

"They do absolutely nothing to stop people from going through Mexico, from Honduras and all these other countries... They do nothing to help us."

Mexico has said it would not pay for a border wall.

Mexican President Enrique Pena Nieto on Tuesday repeated that his country would "never" pay for the border wall that Mr Donald Trump wants built.

"President @realDonaldTrump: NO. Mexico will NEVER pay for a wall. Not now, not ever. Sincerely, Mexico," Mr Pena Nieto said on Twitter.