Top Republican trims defense budget plan The Republican chairman of the House Armed Services Committee is recommending a defense budget for 2018 that's more in line with the thinking of his GOP colleagues. The Armed Services Committee chairman, congressman Mac Thornberry of Texas, is pushing for a defense budget that's larger than at any point during the wars in Iraq and Afghanistan. Thornberry's plan will propose $37 billion above what President Donald Trump requested for core Pentagon operations plus another $65 billion for warfighting missions.