WASHINGTON (NEXSTAR) -The presidential candidates are making stops across the country to win over votes in these final few weeks before Election Day. With 18 days left, the candidates are going all in on winning over those undecided voters in swing states who could decide the election. Vice President Kamala Harris spent the day stumping in Wisconsin Thursday. "This is going to be a tight race until the very end,” said Harris. Wisconsin is one of the "Blue Wall states,” along with Michigan and Pennsylvania that Harris is zeroing in on in these final days.  She told voters a lot is on the line this election. "Donald Trump is increasingly unstable,” said Harris. Former president Donald Trump shot back at Harris while speaking at an annual dinner for Catholic Charities in New York. "Very disrespectful,” said Trump. Both candidates traditionally attend in person, but Harris sent in a video message.   "Which is deeply disrespectful to the event and in particular to our great Catholic community,” said Trump. Earlier Thursday, Trump's running mate Senator JD Vance (R-Ohio.) stopped in battleground Pennsylvania, telling voters Trump would lower costs for Americans by increasing domestic energy production. "We're going to drill, baby, drill, and unleash American energy,” said Vance. Harris's running mate, Governor Tim Walz (D-Minn.) went after Vance for refusing to explicitly say Trump lost the 2020 election. "Here's the good news. If you're sick of these guys, you can say no to them,” said Walz. Both candidates are focusing on Michigan Friday.  Trump has a rally in Detroit and Harris will make stops in Lansing and Oakland County.