Prime Minister Anwar Ibrahim faces his biggest test in managing his unity government after two ministers resigned and one left Umno to join PKR. Analysts believe cabinet changes are necessary, particularly for the economy and environment portfolios, but the defection of Tengku Zafrul from Umno to PKR could cause tension between the two parties. Anwar needs to handle the situation carefully to maintain unity, even if it involves reshuffling ministerial positions.Political analysts suggest Anwar faces challenges in finding suitable candidates for PKR's quota and managing discontent within his party over recent changes. Tengku Zafrul, whose tenure as senator ends this year, might need a by-election to retain his position. While Umno members may not be overly upset about Zafrul's departure, Anwar's biggest challenge is maintaining unity within PKR itself.