Donald Trump to meet Mexican president on Wednesday

Republican White House candidate Donald Trump has accepted an invitation from the president of Mexico Enrique Peña Nieto, and the two will meet on Wednesday in Mexico City.

Trump is expected to deliver a speech on immigration in Arizona just hours after the meeting with Peña Nieto, in which he will clarify his stance on key issues surrounding, among other things, the US border with Mexico.

The nominee has muddled his views somewhat on the issue of building a physical wall between the two countries in recent weeks, but he reiterated his desire to solidify the border with a tweet on Tuesday.

The Mexican president has extended invtitations to both major candidates for the US presidential election, which is due to take place on November 8 this year.

During his campaign the New York tycoon has promised to make Mexico pay for the construction of the wall, something Peña Nieto has rubbished.

As he launched his presidential campaign in 2015, he said that illegal immigrants coming from Mexico were "bringing drugs, they're bringing crime, they're rapists."

A spokesperson for Democratic rival Hillary Clinton said that Trump's trip to Mexico is unimportant in comparison with his speech in Phoenix, Arizona.

“What ultimately matters is what Donald Trump says to voters in Arizona, not Mexico, and whether he remains committed to the splitting up of families and deportation of millions," said Jennifer Palmieri, the Democratic campaign's communications director.