By Jarrett Renshaw and Alexandra Ulmer (Reuters) – Former President Donald Trump is weighing how much to spend and how many Republican candidates to fund in this year’s elections as he faces pressure to use his war chest to help Republicans gain control of Congress, two sources familiar with the matter said. Trump’s Save America leadership political action committee has become a fundraising juggernaut since its inception in November 2020, amassing some $112.5 million in cash but spending only around $17 million to help pay for rallies and promote Republicans, according to the latest federal fi…