A group of 43 senators, including six Republicans, is saying President Trump’s plan to boost defense spending in the next fiscal year by slashing the State Department and foreign aid would undermine U.S. national security and economic interests.

The group, led by Sen. Dick Durbin, D-Ill., and freshman Sen. Todd Young, R-Ind., include members of the foreign relations and armed dervices committees and are the latest evidence of widespread opposition in the chamber to Trump’s budget plans. Their letter was signed Thursday and sent to Senate budget officials and appropriators.