Read: The most important documents related to the Trump impeachment inquiry

The impeachment inquiry into President Donald Trump has left quite a paper trail, which started with a whistleblower complaint about Trump's interactions with the President of Ukraine, led to the White House releasing its transcript of the phone call in question and extends with each new subpoena issued by House Democrats to examine whether Trump abused his office.

Posted 3:16 p.m. Oct 14, 2019 — Updated 3:16 p.m. Oct 14, 2019

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CNN — The impeachment inquiry into President Donald Trump has left quite a paper trail, which started with a whistleblower complaint about Trump's interactions with the President of Ukraine, led to the White House releasing its transcript of the phone call in question and extends with each new subpoena issued by House Democrats to examine whether Trump abused his office.

We've assembled links to the key official documents for you to keep track of the unfolding story yourself.

The whistleblower complaint

The anonymous whistleblower complaint from a member of the intelligence community included a letter to the chairmen of both the House and Senate intelligence committees that said Trump tried to get Ukraine to interfere in the 2020 election. The letter, dated August 12, 2019, was declassified and released on September 26.

Read an annotated version of the whistleblower complaint here and read it in its raw form here.

We know it can be hard to keep up with the daily twists and turns around the impeachment inquiry. We boil it down to the essentials and send it to your inbox.

Nancy Pelosi's letter to Congress about the whistleblower

After the existence of the whistleblower became known -- but before the complaint was released -- House Speaker Nancy Pelosi sent a letter to her colleagues imploring the Trump administration to allow the whistleblower to come before Congress.

Read Pelosi's letter here.

The Trump-Ukraine phone call transcript

After days of speculation about what actually was said during Trump's July 25 phone call with Ukrainian President Volodymyr Zelensky, the White House gave in to Democratic demands and released a rough -- not word-for-word -- transcript of the conversation.

Read the call transcript here.

Intelligence community inspector general's letter about the whistleblower complaint

The internal watchdog for the intelligence community sent a letter to acting Director of National Intelligence Joseph Maguire on August 26, two weeks after the whistleblower complaint was received by the inspector general's office. The inspector general wrote that "there are reasonable grounds to believe" that the whistleblower complaint constitutes an "urgent concern" under the law.

Read the letter here.

Whistleblower's attorney expresses 'serious concerns'

A lawyer for the whistleblower cited Trump's statements to express his concerns that "our client will be put in harm's way."

Read the letter here.

House Democrats subpoena Rudy Giuliani

House Democratic committee chairmen Adam Schiff, Eliot Engel and Elijah Cummings issued a subpoena on September 30 to Trump's personal lawyer Rudy Giuliani for documents related to Ukraine as part of the House impeachment inquiry.

Read the letter announcing the subpoena here.

Damning text messages released

House Democrats released text messages between US and Ukrainian officials that appear to show an understanding that if Ukraine wanted military aid and a visit to Washington, the Ukrainians would need to agree to investigate the origins of the Russia investigation as well as Joe Biden and his son Hunter.

Read the text messages.

White House subpoenaed

On October 4, House Democrats subpoenaed the White House for documents related to Ukraine, after sending a separate request for documents to Vice President Mike Pence.

Read the subpoena here.

White House to Democrats: We 'cannot participate in your partisan and unconstitutional inquiry'

On October 8, the White House told House Democrats that they were seeing to "overturn the results of the 2016 election and deprive the American people of the President they have freely chosen" and the administration will not be cooperating.

Read the White House's letter here.

Giuliani associates indicted

Two associates of Rudy Giuliani connected to efforts to dig up dirt in Ukraine on Joe Biden were indicted on criminal charges for allegedly funneling foreign money into US elections. They were arrested October 10 at an airport outside Washington.

Read the indictment here.

Giuliani associates subpoenaed

The same day they were indicted, the two Giuliani associates -- Igor Fruman and Lev Parnas -- were subpoenaed by House Democrats.

Read the subpoena here.

Rick Perry subpoenaed

House Democrats issued a subpoena October 10 to Energy Secretary Rick Perry for documents related to the Trump administration's contacts with Ukraine as part of the impeachment inquiry.

Read the subpoena here.

Updates will be added.

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