(Reuters) -Weakening travel demand, signaled by grim earnings forecasts of travel-related companies, may erase billions of dollars from the U.S. economy this year as the Trump administration's trade policy takes a toll on consumer sentiment, analysts have warned. "Anti-American sentiment could be driving a decline in international tourism, which is considered a service export," J.P.Morgan said in a note last week. Goldman Sachs and J.P.Morgan projected lower foreign travel spending to trim 0.1% from U.S. GDP this year, adding that the hit could be as much as 0.2% to 0.3%.