A firestorm ignited by President Donald Trump’s remarks last week has impaired lawmakers’ ability to reach a deal on immigration and spending levels, according to congressional aides. Sources also caution of a possible government shutdown at week’s end. Congressional aides say they are expecting a short-term deal funding the government for a few weeks to come to the table, but by no means do they feel it is guaranteed. Prospects for any deal diminished because of controversial reported comments last week from President Trump in a meeting with lawmakers about his desire to stop immigration from “shithole countries.” Mr. Trump denied reports of his remarks, saying “they weren’t made,” and accused Democrats of backing away from a deal. Two Republican senators also called into question the reports quoting Mr. Trump, though others in attendance have confirmed them.