Clarence Thomas (left) and Attorney General Merrick Garland (right).Getty ImagesDemocratic Senators asked Merrick Garland for a special counsel investigation into Clarence Thomas.They seek to probe Thomas's ethics and the "serious possibility" of tax fraud from undeclared gifts.Thomas's financial ties to billionaire Harlan Crow and other elites have drawn increasing scrutiny.Two Democratic senators have called on Attorney General Merrick Garland to open a special counsel investigation into Clarence Thomas.in a letter released Tuesday, Sens.