WASHINGTON - Conservative justices holding the Supreme Court's majority are skeptically questioning President Joe Biden's plan to wipe away or reduce student loans held by millions of Americans.In arguments on Tuesday stretching well beyond the allotted two hours, Chief Justice John Roberts led his conservative colleagues in questioning the administration's authority to broadly cancel federal student loans because of the COVID-19 emergency.A student speaks as student loan borrowers gather at the Supreme Court the evening before the court hears two cases on student loan relief to state the relief is legal and needs to happen immediately on Feb.