Following the unplanned call from Hillary, he continued to speak to the crowd of more than 500.
He went to criticize Republicans who plan to repeal Obamacare and President Obama's gun control reforms.
Clinton also praised Hillary as "the best change-maker I ever saw."
See Bill and Hillary Clinton as they fell in love:
Bill and Hillary Clinton falling in love throwbacks
Hillary Clinton phones Bill as he makes campaign rally speech
Arkansas Governor Bill Clinton comforts Hillary Rodham Clinton on the set of the news program '60 Minutes' after a stage light unexpectedly broke loose from the ceiling and knocked her down, January 26, 1992. (Photo by CBS Photo Archive/Getty Images)
NEW YORK, NY - JULY 14: Certain Democratic presidential nominee Bill Clinton (R) is applauded by his wife Hillary 14 July 1992, before his address to the Women's Caucus of the 1992 Democratic National Convention, New York. Clinton is campaigning in New York along with his running mate Sen. Al Gore. (Photo credit should read MARK PHILLIPS/AFP/Getty Images)
1993: American statesman Bill Clinton, the 42nd President of the United States, and his wife, lawyer Hillary Rodham Clinton, have a laugh together on Capitol Hill, Washington DC. (Photo by Consolidated News Pictures/Getty Images)
WASHINGTON, DC - APRIL 27: First Lady Hillary Clinton (L) laughs after introducing US President Bill Clinton 27 April in the East Room of the White House in Washington, DC. The President and First Lady were attending a celebration marking the 25th anniversary of the Kennedy Center. (Photo credit should read RICHARD ELLIS/AFP/Getty Images)
SAN DIEGO, : US President Bill Clinton (R) gets a hug from his wife Hillary after the presidential debate 16 October at Shiley Theater at the University of San Diego in California. This is the last debate prior to the 05 presidential election. AFP PHOTO Vince BUCCI (Photo credit should read Vince Bucci/AFP/Getty Images)
WASHINGTON, : US President Bill Clinton (R) leans towards US First Lady Hillary Clinton 17 July in the East Room of the White House during a ceremony for the Friends of Art and Preservation in Embassies Program. Arkansas court watchers are expecting President Clinton to testify by videotape 17 July in the criminal trial of two former associates. (ELECTRONIC IMAGE) AFP PHOTO/Paul J. RICHARDS (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)
291964 06: (NO NEWSWEEK - NO USNEWS) President Bill Clinton and his wife Hillary dance at an inaugural ball January 20, 1997 in Washington, DC. Clinton attended various inaugural balls after his defeat of Bob Dole in the national presidential election. (Photo by Cynthia Johnson/Liaison)
PHILADELPHIA, : US President Bill Clinton has his chin pinched by First Lady Hillary Clinton during kick-off ceremonies for the Presidents' Summit for America's Future at the Marcus Foster Stadium 27 April in Philadelphia, PA. The Clintons were joined by the Vice President, and former Presidents Bush, and Carter for the volunteerism campaign. AFP PHOTO PAUL J. RICHARDS (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)
ST. THOMAS, UNITED STATES: US President Bill Clinton and First Lady Hillary Clinton dance on the beach of Megan Bay, St. Thomas, US Virgin Islands 04 January shortly after taking a swim. The President and his family concluded their vacation on the tropical island and are returning to Washington. (ELECTRONIC IMAGE) AFP PHOTO/PAUL J. RICHARDS (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)
WASHINGTON - SEPTEMBER 10: (NO U.S. TABLOID SALES) U.S President Bill Clinton and First Lady Hillary Clinton smile at each other during a Democratic Business Leaders event September 10, 1998 in Washington D.C. (Photo by David Hume Kennerly/Getty Images)