I have a screen shot and the relevant US Code.
U.S. Code - Title 18: Crimes and Criminal Procedure
Text
(a) Prohibition. - (1) In general. - It shall be unlawful for any person to solicit or receive a donation of money or other thing of value in connection with a Federal, State, or local election from a person who is located in a room or building occupied in the discharge of official duties by an officer or employee of the United States.
It shall be unlawful for an individual who is an officer or employee of the Federal Government, including the President, Vice President, and Members of Congress, to solicit or receive a donation of money or other thing of value in connection with a Federal, State, or local election, while in any room or building occupied in the discharge of official duties by an officer or employee of the United States, from any person. (2) Penalty. - A person who violates this section shall be fined not more than $5,000, imprisoned not more than 3 years, or both. (b) The prohibition in subsection (a) shall not apply to the receipt of contributions by persons on the staff of a Senator or Representative in, or Delegate or Resident Commissioner to, the Congress or Executive Office of the President, provided, that such contributions have not been solicited in any manner which directs the contributor to mail or deliver a contribution to any room, building, or other facility referred to in subsection (a), and provided that such contributions are transferred within seven days of receipt to a political committee within the meaning of section 302(e) of the Federal Election Campaign Act of 1971.
Page 139 of the House Ethics manual also explicitly disallows fundraising using official resources (building are considered official resources):
The House buildings, and
House rooms and offices – including district offices – are supported with official
funds and hence are considered official resources. Accordingly, as a general rule,
they may not be used for the conduct of campaign or political activities.
Thus, for example, a Member may not film a campaign commercial or have
campaign photos taken in a congressional office. For rules on filming and taking of
photos on grounds near the Capitol, the office of the Sergeant at Arms should be
contacted.
In addition, House rooms and offices are not to be used for events that are
campaign or political in nature, such as a meeting on campaign strategy, or a
reception for campaign contributors.11 However, under long-standing Committee
policy, when a Member is sworn in, the Member may hold a ―swearing-in‖ reception
in a House office building that is paid for with campaign funds.12 A criminal statute
that prohibits the solicitation of campaign contributions in any House building,
room, or office is discussed below in this chapter, in the section on solicitation of
contributions.
9
Can't wait to watch the Republicans squirm out of this one. Probably won't take much but at least the media seems willing to focus on the Republicans actions right now.