WASHINGTON (AP) — Congress can get so busy that senators and their staffs don't always have time to scrutinize bills they pass and letters they sign. Or so it seemed this week, anyway.

Two episodes left Democrats blushing and some Republicans muttering under their breath.

Republicans ridiculed Democrats for claiming they somehow missed a key provision in a human trafficking bill filed two months ago.

Democrats said GOP aides should have flagged the provision. Republicans laughed.

But some Republicans suggested they may have acted hastily in sending a letter to Iran's leaders. It warned about cutting a nuclear agreement with President Barack Obama.

Many of the 47 who signed the letter did so as a snowstorm approached Washington. Republicans defended the letter, but some said they could have acted more deliberately.

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