President Donald Trump's executive order restricting entry of skilled foreign workers into the US, mainly on H-1B and L1 visas, has resulted in an estimated loss of $100 billion to companies in the US, a top American think-tank claimed. The executive order signed by Trump on June 22, that had temporarily banned issuing fresh H-1B and L-1 visas till December 31, caused a negative impact to the valuation of Fortune 500 firms equivalent to over $100 billion in losses, Brookings Institute said in a report released this week.