Politics Thom Tillis and the Power of a Single Senator Sen. Thom Tillis was getting impatient. Tillis characterized his stance as a response to Noem giving the committee the cold shoulder. Committee Chairman Sen. Chuck Grassley has asked Noem twice over the past year to appear before the panel. Unsurprisingly, there are many analysts who blame President Donald Trump, claiming that his decision to end EV tax credits is killing the market. And for all that anguish, Trump has appeared to walk away with little more than the status quo in Greenland.