Some federal law enforcement officials said they were growing doubtful that the letter would prove to be contaminated.
Chancellor Angela Merkel is under increasing pressure to reduce the numbers of refugees reaching Germany and voters are growing doubtful that the state can tackle the crisis, her key ally and Finance Minister Wolfgang Schaeuble said on Monday.
He also reconnected with the sad and noble heart of the cello repertory, the six solo suites by Bach, which he had stopped performing after growing doubtful about his approach.
Eventually, though, the Germans grew doubtful of their informer and passed on their suspicions to American intelligence officials.
Yet Mr. Obama acknowledged in his State of the Union address that voters had grown doubtful about his promise of hope and change.
Two days later, when he lost his lead in Iowa to Ben Carson, he'd grown doubtful: "I honestly think those polls are wrong".
Mr. Smith accompanied her on her first visit to the obstetrician, where she learned that she was carrying twins, but then he grew doubtful that the babies were his, he said.
Mr. Paine pushes beyond this ostensibly disinterested report, suggesting that one reason the board might have grown doubtful was because its chairman at the time, Alan C. Lloyd, had joined the California Fuel Cell Partnership.
In 1996 a Los Angeles newspaper reported that "the air board grew doubtful about the willingness of consumers to accept the cars, which carry steep price tags and have a limited travel range".
And yet, on a recent afternoon, Senator Dave Thompson said he had grown doubtful that the "right to work" amendment he hoped to put before voters this fall — a proposition requiring no approval by the governor — would survive a vote of his fellow Republican legislators, or even find its way out of Republican-controlled committees.
Little more than a week later, the French authorities say they have grown doubtful of his claims to terrorist ties, though questions remain about how Mr. Merah, an unemployed 23-year-old of Algerian descent, acquired a large cache of firearms and $26,000 in cash.
