WASHINGTON (AP) — House Democrats are preparing a vast oversight agenda, with investigations of President Donald Trump, his family and his administration if the party sweeps control of the chamber from Republicans in the November elections. The undertaking is as robust as it is daunting, spanning several House committees. With majority power comes bigger budgets and staff, and the ability to investigate, subpoena and potentially course-correct what the Democrats say are widespread corruption and abuses of power. Impeachment of the Republican president and Cabinet officials is not off the table. “There is a cost to the American people of the...