One of the co-founders of the company that assembled the infamous "Russian Dossier" on President Trump will testify Tuesday in front of the Senate Judiciary Committee and may be forced to answer who funded the work to assemble the document.

Glenn Simpson will likely face tough questions about the document that would later emerge as an important part of the numerous ongoing investigations into Russian meddling in the 2016 elections, according to ABC News.

Simpson is a former reporter for the Wall Street Journal who then created Fusion GPS — a company that does political opposition research and numerous other intelligence-related services that some have labeled as a smear machine.

Although Simpson is behind the firm, the dossier was assembled in part by former British spy Christopher Steele, and contains numerous salacious allegations about Trump. Most of those claims have either been debunked, or are no longer taken seriously.

Original funders for the document were Republicans who sought to keep Trump from the GOP nomination, but afterwards Democrats seized on the work and took over the funding in an attempt to cripple Trump's campaign against Hillary Clinton.

Still, the document created high-level security concerns including worries that it could be used to blackmail Trump during the transition period and in the early days of his presidency. Due to those factors, the document's provenance has become even more important in the overall Russian investigation.

Republicans especially have seized on the document, believing it may have influenced the tide of events that led to the appointment of a special counsel to investigate President Trump and his associates even though most of the dossier is either unproven or debunked.

A media report said the dossier was used by the FBI to gain a warrant to surveil Carter Page, someone who had briefly worked for the Trump campaign in 2016 as a foreign policy adviser.

Page, who has numerous business ties to Russia, previously told the Washington Examiner he believes the surveillance conducted on him in 2016 is partial proof that backs up the tweet by Trump in which he claimed to have been "wire tapped" by the previous administration.

Bill Browder, the CEO of an investment firm that has a large portfolio of investments in Russia, recently testified to the Senate Judiciary Committee Fusion GPS operated a smear campaign against him for some of the political positions he and his firm had taken against the Putin regime.

The talk with the committee comes when nearly all elected officials are out of Washington and are in their home states, making it a near certainty that the interview will be conducted by committee staff.