IRS supervisors ignored employees who tried to warn agency higher-ups of fraud in a program designed to collect taxes from immigrants, resulting in the agency paying out potentially bogus refunds, according to an official audit released Wednesday. The Treasury’s inspector general for tax administration (TIGTA) said the IRS is too focused on getting out refunds quickly rather than getting them only to qualified taxpayers. Auditors also said the agency eliminated some methods employees had used to figure out questionable refund requests and doesn’t have the right training or tools to screen out bogus identity documents when immigrants apply for taxpayer...