The normally limelight-shunning US First Lady Melania Trump will take centre stage at the Republican convention as she makes the case for her husband's underdog re-election bid.
The party conference's second night will also hear from the president's children Eric and Tiffany Trump.
President Donald Trump will address the convention's final night on Thursday.
He currently trails his Democratic challenger Joe Biden in opinion polls ahead of November's election.
A total of 17 million people watched the Republican convention's first night on Monday, according to Nielsen.
Some 19.7 million TV viewers tuned in to the first night of the Democratic National Convention last week.
The US first lady is delivering Tuesday evening's keynote address before a small audience at the White House.
Her decision to speak from the seat of presidential power has angered Democrats, who say the chosen venue is an inappropriate use of government resources.
Over the weekend, Mrs Trump unveiled renovations to the White House Rose Garden, which included the relocation of about a dozen crabapple trees that were planted by former First Lady Jackie Kennedy.
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