Group 1 - President Trump announced that current Transportation Secretary Sean Duffy will temporarily serve as the NASA Administrator [1] - Trump's decision to withdraw the nomination of Jared Isaacman, a close associate of Elon Musk, for the NASA position has become a focal point of controversy [1][2] - Trump emphasized that the new nominee should prioritize "America First" goals in space exploration [1] Group 2 - Isaacman, CEO of Shift4 Payments, has a close relationship with Musk and has paid hundreds of millions for services from Musk's SpaceX [1] - Isaacman expressed that NASA needs a leader trusted by the President, indicating an attempt to ease tensions [2] - The Trump administration is pushing for significant cuts in NASA's workforce, aiming to lay off 2,100 senior employees through early retirement and buyouts [2]