• Fed credibility concerns weigh on dollar, with cable up to 1.3725 in Asia

• 1.3725 is highest level since January 2022 (1.3749 was high that month)

• WSJ says Trump mulls announcing Powell's replacement as early as September

• Trump says he is considering three or four candidates for next Fed chair

• 1.3591 was GBP/USD low on Wednesday, before Powell spoke to Senate panel

• Defiant UK PM Starmer defends leadership as welfare rebellion grows

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(Robert Howard is a Reuters market analyst. The views expressed are his own)