WASHINGTON (AP) — Lawmakers are under orders to finish action on President-elect Barack Obama’s nearly $800 billion economic recovery plan by mid-February. But already it is plain that a set of serious fissures need to be bridged if the bill is to be completed within five weeks.

Obama urged Congress on Thursday to “act boldly and act now” to fix an economy growing perilously weaker, even as top Democrats said they dislike key provisions, especially the design of his tax cuts.

Democrats such as Budget Committee Chairman Kent Conrad complained openly that many of the incoming administration’s proposed tax cuts wouldn’t work. Republicans warned against excessive new spending, with both parties signaling the incoming president they intend to place their own stamp on the economic recovery effort.

Conrad, D-N.D., and Sen. Judd Gregg, R-N.H., also staked a firm position against using the economic recovery plan for permanent spending increases, opening a split with House Democrats hoping to use the plan to broaden eligibility for unemployment insurance and boost education spending.

“Doing things that would have a permanent effect when we face trillion-dollar deficits as far as the eye can see is just unwise,” Conrad said.