"Congress needs to have the courage to act and renew the assault weapons ban," Harris told a teachers convention in Chicago before visiting the shooting scene at nearby Highland Park.
The central Minnesota city with about 600 people was deluged by nearly a foot of rain last week, sending the Little Elk River out of its banks and flooding homes.
The disaster inflicted by the quake heaps more misery on a country where millions face increasing hunger and poverty and the health system has been crumbling since the Taliban retook power last year.
The hardest hit areas were remote farming villages in the eastern Afghan province of Paktika. "All the village completely is destroyed," said one man, showing collapsed homes on a cell phone video.
Historic floodwaters that raged through Yellowstone National Park and nearby communities may have permanently altered the course of a popular fishing river and left the sweeping landscape forever changed.
Major flooding swept away at least one bridge, washed away roads and set off mudslides in Yellowstone National Park on Monday, prompting officials to close the entrances to the popular tourist attraction and evacuate visitors.
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