This is a straw man. The campaign is not to defund the entire NSA, it is to defund collection of records "that pertain to persons who are not subject to an investigation under Section 215".
Exactly. The NSA can't use their funds however they feel like. They have to account to several governmental entities for their (secret) precise funding, and I doubt they would lie about it and take their resources from their useful tasks in order to reallocate them to spying on non-suspect citizens.