Recent revelations of significant financial ties between the Brookings Institution and Qatar’s government are raising new questions about the policy positions of the influential Washington think tank—including one top scholar’s writings about an al Qaeda-linked group, known as Ahrar al-Sham, that is funded by a terrorist financier linked to the Qatari royal family.The New York Times reported earlier this month that Qatar has pledged a $14.8 million, four-year donation to Brookings, making it the “single biggest foreign donor” to the think tank. That money will help finance Brookings’ Doha Center in Qatar and its project on U.S. relations with the...