How To Create Two Tables That Reference Each Other?

I'm trying to create two tables, Admins and SecurityGroups, I want to have the ability to assign a security group to an admin so that I don't have to specify all the rights individually to every admin. So, I have the securityGroupID in the Admins table and I reference the SecurityGroups table for data integrity. On the other hand, for audit purposes, I also want to record which admin created the security group so I have the AdminID in the SecurityGroups table and I reference the Admins table for data integrity. Of course when I try to create any of those tables I get an error message that the other table doesn't exist. I wonder if this can be done without having to remove the references constraint from one of the tables and then using alter table. Here's an example below to make it clearer:

CREATE TABLE Admins
(
AdminID INT NOT NULL PRIMARY KEY,
SecurityGroup NULL REFERENCES SecurityGroups (SecurityGroupID)
)

CREATE TABLE SecurityGroups
(
SecurityGroupID INT NOT NULL PRIMARY KEY,
CreatedBy INT NOT NULL REFERENCES Admins (AdminID)
)

Any suggestions are highly appreciated...