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Senate control hinges on 'stroke' Senate control hinges on 'stroke'
(40 minutes later)
A US senator has suffered a suspected stroke, raising the possibility that President George W Bush's party will regain control of the Senate.A US senator has suffered a suspected stroke, raising the possibility that President George W Bush's party will regain control of the Senate.
Democratic Senator Tim Johnson's office said he was undergoing tests at George Washington University Hospital.Democratic Senator Tim Johnson's office said he was undergoing tests at George Washington University Hospital.
The Democrats captured control of the upper house of Congress by a single vote in elections last month. The Democrats captured control of the upper house of Congress by a single seat in elections last month.
If Senator Johnson stands down, the Republican governor of his state, South Dakota, will name his successor. If Senator Johnson, 59, stands down, the Republican governor of his state, South Dakota, will name his successor.
That person - likely to be a Republican - would serve until the next general election in 2008.
Mr Johnson, who turns 60 at the end of December, had prostate cancer in 2004 but says he is now clear of the disease following an operation.
His wife has also had cancer.
There is little precedent for forcing a living senator to stand down against his will.
A predecessor of Mr Johnson, Karl Mundt, continued to hold his Senate seat for three years after a stroke that incapacitated him in 1969, although he was unable to attend Senate sessions.