• Cable has traded a quarter-cent range thus far Wednesday; 1.2908-1.2933

• Range peak is seven pips shy of Tuesday's high (1.2880 was Tuesday's low)

• Trump tariff announcement scheduled for White House Rose Garden at 2000 GMT

• USD may rise if Trump opts for 20% universal tariff - an aggressive option

• Pound might gain if British exemption from U.S. tariffs is then agreed

• BofA goes 'tactically short' EUR/GBP via 1-month option

GBPUSD

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