But, again, under the Senate agreement, any one senator would block such a vote.

But, as its name implies, one senator can block the agreement.

So, one Senator can't block legislation - it takes about 40.

But Senate rules permit any senator to block a vote.

But a few senators, widely seen to be carrying the administration's water, have thus far blocked a vote.

Moderate Republican senators object to parts of the bill, but did not block its consideration.

But under the impeachment rules adopted unanimously by the Senate, a single senator could block such a move.

But Democratic senators have, quite reasonably, blocked a handful of the most extreme ones.

Democratic senators, in sweet collegiality with Republicans, are blocking the bill.

The filibuster became possible, and since any Senator could now block a vote, 100% support was required to bring the matter to a vote.