• AUD/USD hits 0.6307 after extending north from 0.6219 (Monday's 4-week low)

• 0.6307 is highest level since Friday (0.6312 was high that day)

• Trump tariff announcement scheduled for White House Rose garden at 4pm ET

• USD might strengthen if Trump opts for aggressive 20% universal tariff

• Australia to 'stand up for national interests' on U.S. tariffs, says PM

• GOP projected to win two Florida special elections, boosting House majority

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