Aiming to bolster his case for a wall along the US border with Mexico, President Donald Trump said on Monday he would make a prime-time televised address and visit the border this week as the government marked its 17th day of a partial shutdown. Democrats, who now control the US House of Representatives, have rejected Trump's demand for $5.7 billion to help build a wall. Without a deal on that sticking point, talks to fund the government have stalled. Vice President Mike Pence said Trump had not made a decision about his threat to declare a national emergency and build a wall without congressional approval. Asked about the possibility of legal challenges and whether the White House counsel's office had reviewed the matter thoroughly, Pence told reporters: 'They're looking at it, and the president is considering it.'