Trump to make trip to Mexico before immigration speech

By Steve Holland WASHINGTON (Reuters) - U.S. Republican presidential nominee Donald Trump will meet Mexican President Enrique Pena Nieto on Wednesday in a hastily arranged visit to Mexico hours before delivering a highly anticipated speech on how he will tackle illegal immigration. Republican vice presidential candidate Mike Pence, in several television interviews early Wednesday, said Trump would speak to the Mexican leader about border security, including his signature pledge to build a wall a