President Donald Trump’s latest plan to overhaul the American immigration system has left some immigrant workers confused. That left the White House on Saturday scrambling to clarify that its new $100,000 fee on visas for skilled tech workers that soon will go into effect only applies to new applicants and not to current visa holders. The president on Friday signed a proclamation that will require the fee for what are known as H-1B visas — meant for high-skilled jobs that tech companies find hard to fill.