1041 GMT - The policy environment is becoming increasingly challenging for the Federal Reserve ahead of Wednesday's interest-rate decision, Allspring Global Investments' Rushabh Amin says in a note. "A firmer growth and inflation backdrop is coinciding with greater uncertainty around fiscal policy and questions regarding fiscal discipline," the portfolio manager for the multiasset team says. This raises the prospect that monetary policy may face greater constraints than in previous cycles, he says. Financial markets have repriced meaningfully in recent months, with higher commodity prices and rising yields contributing to tighter financial conditions, he says. "Yield movements across the Treasury curve have been notably one-directional, reflecting growing confidence that rates may need to remain elevated for longer."