Hillary Clinton has built a double-digit lead over Donald Trump in their widely anticipated presidential showdown.

According to a new Reuters/Ipsos national poll, the Democratic front-runner now leads the presumptive Republican nominee 46 percent to 35 percent, with 19 percent of voters insisting they will not support either candidate.

Clinton's 11-point bulge comes just days after the same poll showed Trump having pulled into a statistical deadlock with her among likely general election voters.

Clinton Steps up Attack

The latest swing also coincides with Clinton's stepped up attacks on Trump over policy positions that include a vow to deport millions of undocumented immigrants if he is elected.

In recent days, Trump has also been dogged by developments surrounding an upcoming fraud trial he faces in connection with his namesake Trump University and the pace at which he dispersed money he raised to aid U.S. veterans.

In the Trump University scandal, a trio of litigants allege they were misled into paying up to $35,000 for courses billed as offering the secrets of Trump's lucrative investment strategies.

More recently, Trump has ripped the Mexican judge overhearing the case as displaying a "conflict of interest" in allowing the case to continue.

The controversial New York City real estate mogul has all but sealed his rise as the face of the Republican Party with a string of big wins in several state elections, forcing the likes of party rivals Ted Cruz, Marco Rubio, John Kasich and Jeb Bush to the sidelines.

Clinton Closing to Wrapping up Nomination

Meanwhile, Clinton is hoping to formally bag the democratic nomination in California's upcoming primary. Voters there go to the polls on June 7, and word is Vermont Sen. Bernie Sanders is facing mounting pressure to drop out of the race if he does not fare well there.

During a recent foreign policy speech in the state, Clinton tore into some of Trump's proposed policies as "dangerously incoherent," before further ridiculing him as both frightening and laughable.

Later, Trump insisted the former secretary of state had distorted many of his positions.