WASHINGTON — A week after the 2020 election, Republican elected officials and the Trump administration are advancing their latest arguments to get rid of the Affordable Care Act, a long-held GOP goal that has repeatedly failed in Congress and the courts.In arguments Tuesday, the U.S. Supreme Court heard its third major fight over the 10-year-old law, popularly known as “Obamacare.” Republican attorneys general in 18 states and the administration want the whole law to be struck down, which would threaten …