You will be given a definition of a task first, then some input of the task.
Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.

Sentence: 'The chairman of the Republican National Committee , Ken Mehlman , may have thought he would get a laugh when he used this line Friday in a speech to the Southern Republican Leadership Conference : " Not only can the Democrats not settle on an agenda , they ca n't even agree on a slogan . "', Argument/Subject 1: 'ken mehlman', Argument/Subject 2: 'republican national committee'
Output:
be chairman of