Term is used to describe a tactic available to senators who wish to block the passage of a bill?

Filibuster is a tactic used in the United States Senate to prevent a measure from being brought to a vote by means of obstruction. The most common form occurs when one or more senators attempt to delay or block a vote on a bill by extending debate on the measure.

Explanation:

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

the secretary of state, appointed by the president with the advice and consent of the senate, is the president's chief foreign affairs adviser. the secretary carries out the president's foreign policies through the state department and the foreign service of the united states.