Hillary Rodham Clinton, the former secretary of state and potential 2016 presidential candidate, is planning to make remarks about the intensifying situation in Syria during a visit to the White House on Monday. Clinton has not personally addressed the Aug. 21 chemical weapons attack that U.S. officials say was carried out by Syrian President Bashar al-Assad’s regime or how she believes the United States should respond. Although an aide issued a statement last Tuesday saying she supports President Obama’s effort to seek authorization from Congress for a retaliatory strike.