U.S. President Donald Trump prepares to address the annual March for Life rally, taking place on the National Mall, from the White House Rose Garden in Washington, U.S., January 19, 2018. REUTERS/Carlos Barria

WASHINGTON (Reuters) - U.S. President Donald Trump said in a post on Twitter on Friday that he was making progress with lawmakers to avoid a shutdown and advocated a four-week funding extension.

Although Trump said he had an excellent preliminary meeting with Senate Democratic leader Chuck Schumer earlier Friday, a senior White House official said differences still remained, and they had not yet reached an agreement between extending funding for four weeks compared to a five-day option that Schumer has touted.