will use a major speech to Saturday to underline the choice facing them in November's election, warning that four more years of President will unleash extremist forces on the country.Polls suggest he is on course for a landslide primary win over , his last remaining rival for the Republican nomination, on her home turf of South Carolina later in the day.And aides say he will all but ignore her challenge for the rest of the race, instead turning his fire on Biden.
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