WASHINGTON — The Latest on Republican efforts to overhaul the tax code (all times EDT):

5:45 p.m.

President Donald Trump has issued a thinly warning threat to Democrats who might oppose the Republican tax plan.

That's according to Sen. Sherrod Brown, an Ohio Democrat who attended a White House meeting on the issue Wednesday.

Brown says Trump told senators, "I couldn't imagine being a Democrat and running in 2018 having voted against" the GOP tax legislation.

Brown notes that most of the Democratic members of the tax-writing Senate Finance Committee who were invited to the meeting are up for re-election next year in states Trump won in 2016. Brown is among them.

Trump and Republican leaders in Congress are casting the tax plan as a boon to the middle class. Democrats say it would mostly benefit wealthy individuals and big corporations.

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4:30 p.m.

President Donald Trump tells senators that "maybe someday you'll see my taxes."

The president made the evidently facetious comment in a White House meeting about tax legislation Wednesday with Republicans and Democrats on the Finance Committee.

It was a reference to Trump's refusal to release his tax returns, as past presidents and presidential candidates have done.

The comment was confirmed by a Senate aide briefed on the exchange, who demanded anonymity to disclose details of a private meeting.

— Congressional Correspondent Erica Werner