However, my answer still largely remains. Which is weird. Normally I'd be all for bills being passed without congress inserting their special little projects as riders.
Lately though, I've just plain had it with all things secretive. Tired of trade plans being sold as beneficial to the masses when they do little good for American workers and give all the gains to corporations and their top investors and executives.
Unconstitutional: Groups opposed to Trade Promotion Authority claim that it places too much power in the executive branch, "allowing the president to unilaterally select partner countries for ‘trade’ pacts, decide the agreements' contents, and then negotiate and sign the agreements—all before Congress has a vote on the matter. Normal congressional committee processes are forbidden, meaning that the executive branch is empowered to write lengthy legislation on its own with no review or amendments."
"Fast Track: An Undemocratic Path to Unfair 'Trade'". Public Citizen
Lack of transparency: Democratic members of Congress and general right-to-know internet groups are among those opposed to trade fast track on grounds of a lack of transparency. Such Congressmen have complained that fast track forces "members to jump over hurdles to see negotiation texts and blocks staffer involvement. In 2012, Senator Ron Wyden (D-Ore.) complained that corporate lobbyists were given easy access while his office was being stymied, and even introduced protest legislation requiring more congressional input."
Carter, Zach; McAuliff, Michael. "Why House Democrats Might Kill Obama's Big Trade Deal". The Huffington Post.