[While this question references the 2020 presidential election, it could apply to the 2024 presidential election, as well.]
Q: Can the Trump Campaign use the voter data the Trump Administration received in 2017?
No, because the limited data supplied by the states is/was held by the government and was not released to the campaign.
Q: What happened to this investigation?
The commission conducting the investigation was terminated due to lawsuits and a lack of cooperation by the states. There was no finding of election fraud.
The archived article mentions the Presidential Advisory Commission on Election Integrity. The commission was established by Executive Order 13799 on May 11, 2017, and terminated by Executive Order 13820 on January 3, 2018.
By law, upon termination of the commission, any records created or collected by the commission were transferred to the National Archives and Records Administration.
On January 9, the director of White House information technology stated, in a declaration appended to a motion in Commissioner Dunlap's suit against the commission, that the state voter data the commission had collected would not be sent to DHS or any other agency except the National Archives and Records Administration (NARA), pursuant to federal law and pending the outcome of lawsuits, and that pursuant to federal law and upon consultation with NARA the White House intended to destroy all the state voter data held by the dissolved Commission.
The data collected from the few states that sent records to the commission did not contain all the requested information.
No state has said they will fully comply with the list of demands.